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1·Old mice don't have car keys to lose track of, but they do struggle to remember a place where they once received a nasty shock or a hidden platform in a pool of murky water.

当然小鼠没有汽车钥匙可以遗失，但是通过训练他们能记得曾经的一个地方，那就是它们被轻微电击或忽然间木板敞开让它们落入水中的地方。

2·Hidden in one of the glasses is a slice of lemon. Watch closely and track the glasses.

其中一个杯子里藏有一片柠檬，仔细观察并跟踪那个杯子。

3·Defective shunting of track circuit constitutes a huge hidden trouble to the transportation production.

轨道电路分路不良对运输生产构成巨大的安全隐患。

4·The experimental results showed that this approach can track the target accurately and achieved a higher robustness when the target was severely hidden.

实验结果说明了在目标严重遮挡的时候，本文的方法能够准确的跟踪目标，达到了较高的鲁棒性。