研究发现：城里的树长得快但死得早
<p>你也许知道城里老鼠和乡下老鼠的区别，但你知道城里的树和乡下的树有什么不同吗？研究发现，城里的树生长速度比乡下的树高出四倍，但死亡率是后者的两倍多。这是为什么呢？</p><p><span word="Trees">Trees</span> <span word="in">in</span> <span word="cities">cities</span> '<span word="live">live</span> <span word="fast">fast</span> <span word="but">but</span> <span word="die">die</span> <span word="young">young</span>' <span word="compared">compared</span> <span word="to">to</span> <span word="rural">rural</span> <span word="forests">forests</span>, <span word="warns">warns</span> <span word="a">a</span> <span word="new">new</span> <span word="study">study</span>.</p><p>一项新研究警告说，相比乡间树林里的树，城里的树“长得快但死得早”。</p>
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