The fiddler crab is a living clock.

招潮水蟹是一只活闹钟。

The fiddler crab is a living clock.

招潮蟹就是一座“活钟”。

The majority were clock makers, seal engravers, locksmiths, and cobblers who made their living in the city.

他们中多数是在城市里谋生的钟表手工艺人，印章雕刻者，锁匠，补鞋匠。

TINKERING with the circadian clock, the day-and-night cycle in the physiological processes of all living beings, is rarely a good idea.

捣乱生物钟——万物生灵生理过程中的昼夜节律——绝不是个好主意。

Scientists now believe that many, if not all, living things are born with some type of hidden clock.

科学家们现在相信，即使不是全部，但仍然有很多生物具有天生的某种类型的潜藏时钟。