But trains are also large, complicated, and expensive to repair when they break unexpectedly.
但是火车也非常大、复杂，并且在意外损坏时修理费用昂贵。
At any time when they are swimming they can not only see from side to side, in front and behind but also above and below.
它们在游泳的任何时候，都不仅能左右、前后看，还能上下看。
But in the winter, When the leaves fall off the trees, They also fly away.
但是到了冬天，当树叶落下的时候，它们也飞走了。
But people also freak out when they are scared by something or confused or upset.
但是，人们由于困惑或不安害怕时也抓狂。
But people also freak out when they are scared by something or confused or upset.
但是，人们由于困惑或不安害怕时也抓狂。
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