At the esoteric edge of the timekeeper's craft, they are too wobbly to keep time by themselves.

在这个原子钟的装置里，它们还是太不稳定了，不能靠自身确保时间。

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To help generate lift to keep midwater, the top of the tail extends farther back than the bottom, creating a slant along the back edge.

为了保持在水中不至于沉底，尾部的顶端比底端向后延伸，沿着后端形成一个斜面，产生提力。

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This means the teeth, which grow continuously, can regularly shed damaged areas to keep a well-honed edge.

这就意味着，这些不断生长的牙齿，可以有规律地脱落磨损部分，以保持边缘锋利。

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