Usually, figure usage need not to be defined.
比喻用法一般是不必定义的。
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。
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。
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