不检测和清除异常会导致出现意外行为。

Not checking and clearing exceptions can lead to unexpected behavior.

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细胞凋亡是机体正常的生理机能，是多细胞生物正常更新和清除异常细胞的重要手段。

Apoptosis, which is the basically physiological mechanism, is important on renewing the normal cells and eliminating the abnormal cells for the multicellular organism.

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该异常也会困扰 线程，用户必须显式地清除异常；否则它会一直困扰（术语为 pending）线程。

The exception is also sticky to the thread in the sense that the user must explicitly clear the exception; otherwise it remains bound -- termed pending -- to the thread.

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