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4、 at a speed of 以某种速度 ◆New maglev train nowadays can travel at an amazing speed of 430 km / h. 目前的磁悬浮火车能以每小时430千米的惊人速度行驶。 at top / full speed 以全速 speed up 加速 at a safe / dangerous / low / high speed 以安全 / 危险 / 低 / 高的速度 pick up / gather speed 加快速度 ◆He was driving at top speed down the street when the accident happened. 当事故发生时他正沿着街道高速驾驶。 ◆This drug may have the effect of speeding up your heart rate. 这种药物能够使你的心率加速。 Not only will he or she feel every step of climbing Mount Qomolangma, but the user will also experience the cold, smells, sights and sounds of the surrounding environment… 使用者不仅能够感受到攀登珠穆朗玛峰的每一步的艰辛，还能体验到周围环境的寒冷、气味、景观和声音……。 (1) not only…but also 应连接两个相对称的并列成分(主语、谓语、宾语、状语或分句)。 ◆She not only sings well but also dances beautifully.＝ She doesn't only sing well but also dance beautifully. 她不仅唱得好，而且跳得也很好看。 (2) not only…but also 连接两个分句，并且 not only 位于句首时，第一个分句中的主语和谓语要部分倒装。 ◆Not only does the sun give us light but also it gives us heat. 太阳不仅给我们光，还给了我们热。 ◆Not only did your remark annoy Alixon but also it ruined our party. | 
