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。
They easily break down when they face difficulties.
他们面对困难时很容易崩溃。
Batteries often break open when they are buried directly in a landfill.
当电池被直接埋在垃圾填埋场时，它们经常会裂开。
They are worried about the potential dangers when the dam should break.
他们担心大坝一旦决堤可能带来的危险。
Consequently, when they encounter failure they break down.
因此当他们遭遇失败的时候，他们就崩溃了。
When I’m too lazy to maintain my tools, they rust or break.
当我懒得打理我那些园艺工具的时候，它们就生锈变坏不能用了。
But when they are untied, you can break each stick easily.
但当它们被松开后，你们很容易就能把每一根棍子折断。
When the two fall in love, they inevitably quarrel and break up.
当两人陷入爱情，他们不可避免地争吵和分手。
When the break was over, they resumed their experiment.
课间休息之后，他们重新做实验。
When the break was over, they resumed their experiment.
课间休息之后，他们重新做实验。
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