Usually, figure usage need not to be defined.

比喻用法一般是不必定义的。

youdao

On top of this, it has an absolute validity period which invalidates its usage after a defined period of time.

除此以外，它还具有绝对有效期，即在定义的时间段之后将会失效。

youdao

Note that at defined intervals, you're checking current memory usage.

按照定义的时间间隔检查当前内存使用量。

youdao

By default, bitcoin may not offer anonymity and untraceability like our paper cash today, but it is better described as user-defined anonymity because the decision to reveal identity and usage patterns resides solely with the bitcoin user.

FORBES: Bitcoin Obliterates 'The State Theory Of Money'