打水漂秘籍 20°角投掷效果最佳
<p><span word="A">A</span> <span word="disc">disc</span>-<span word="shaped">shaped</span> <span word="stone">stone</span> <span word="has">has</span> <span word="to">to</span> <span word="be">be</span> <span word="tossed">tossed</span> <span word="at">at</span> <span word="an">an</span> <span word="angle">angle</span> <span word="of">of</span> 20 <span word="degrees">degrees</span> <span word="to">to</span> <span word="achieve">achieve</span> <span word="the">the</span> <span word="maximum">maximum</span> <span word="number">number</span> <span word="of">of</span> <span word="bounces">bounces</span> <span word="across">across</span> <span word="water">water</span>.</p><p>将碟状石子以20°的角度投出可以打出最多次数的水漂。</p><p><span word="Inspired">Inspired</span> <span word="by">by</span> <span word="English">English</span> <span word="scientist">scientist</span> <span word="Barnes">Barnes</span> <span word="Wallis">Wallis</span>, <span word="who">who</span> <span word="invented">invented</span> <span word="the">the</span> <span word="bouncing">bouncing</span> <span word="bomb">bomb</span>, <span word="researchers">researchers</span> <span word="have">have</span> <span word="described">described</span> <span word="the">the</span> <span word="complicated">complicated</span> <span word="physics">physics</span> <span word="behind">behind</span> <span word="the">the</span> <span word="water">water</span>-<span word="skipping">skipping</span> <span word="behaviour">behaviour</span> <span word="in">in</span> <span word="stones">stones</span>, <span word="toys">toys</span> <span word="and">and</span> <span word="even">even</span> <span word="cannonballs">cannonballs</span>.</p><p>英国科学家巴恩斯·威利斯发明了弹跳炸弹，受其启发，研究人员解释了石子、玩具甚至炮弹在水面弹跳这一现象背后的复杂物理原理。</p><p><span word="Naval">Naval</span> <span word="gunners">gunners</span> <span word="as">as</span> <span word="far">far</span> <span word="back">back</span> <span word="as">as</span> <span word="the">the</span> 18<span word="th">th</span> <span word="century">century</span> <span word="bounced">bounced</span> <span word="cannonballs">cannonballs</span> <span word="as">as</span> <span word="a">a</span> <span word="military">military</span> <span word="tactic">tactic</span>.</p><p>上溯到18世纪，海军炮手将炮弹弹跳作为一种军事战术。</p><p>'<span word="Designed">Designed</span> <span word="to">to</span> <span word="breach">breach</span> <span word="German">German</span> <span word="dams">dams</span>, <span word="the">the</span> <span word="weapon">weapon</span> <span word="skipped">skipped</span> <span word="over">over</span> <span word="the">the</span> <span word="water">water</span> <span word="surface">surface</span> <span word="to">to</span> <span word="avoid">avoid</span> <span word="undersea">undersea</span> <span word="torpedo">torpedo</span> <span word="nets">nets</span>.'</p><p>“为了破坏德国大坝，炸弹在水面上弹跳以避开水下鱼雷网。”</p><p><span word="Writing">Writing</span> <span word="in">in</span> <span word="Physics">Physics</span> <span word="Today">Today</span>, <span word="they">they</span> <span word="say">say</span> <span word="water">water</span> <span word="skipping">skipping</span> <span word="has">has</span> <span word="returned">returned</span> <span word="to">to</span> <span word="more">more</span> <span word="docile">docile</span> <span word="roots">roots</span> <span word="of">of</span> <span word="late">late</span> <span word="with">with</span> <span word="toy">toy</span> <span word="balls">balls</span> <span word="that">that</span> <span word="make">make</span> <span word="it">it</span> <span word="much">much</span> <span word="easier">easier</span> <span word="to">to</span> <span word="achieve">achieve</span> <span word="multiple">multiple</span> <span word="hops">hops</span>.</p><p>《今日物理》写到，如今，随着玩具球的出现，打水漂已经变得更加容易驾驭，多次弹跳也变得简单了许多。</p><p><span word="The">The</span> <span word="researchers">researchers</span> <span word="said">said</span>: '<span word="Those">Those</span> <span word="spheres">spheres</span> <span word="are">are</span> <span word="made">made</span> <span word="of">of</span> <span word="an">an</span> <span word="elastic">elastic</span> <span word="material">material</span> <span word="whose">whose</span> <span word="high">high</span> <span word="compliance">compliance</span> - <span word="or">or</span> <span word="ability">ability</span> <span word="to">to</span> <span word="readily">readily</span> <span word="deform">deform</span> - <span word="introduces">introduces</span> <span word="some">some</span> <span word="interesting">interesting</span> <span word="changes">changes</span> <span word="to">to</span> <span word="the">the</span> <span word="skipping">skipping</span> <span word="phenomenon">phenomenon</span>.'</p>
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