certain stage
definitions
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A specific, though perhaps unnamed or unspecified, point in a process, development, or period of time.zh: 特定阶段
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A specific period or phase in the life cycle of an organism or a biological process.zh: 特定生命阶段
examples
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At a certain stage of the experiment, the results became unpredictable.
在实验的某个阶段,结果变得不可预测。
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The larvae enter a certain stage before pupation.
幼虫在化蛹前进入一个特定阶段。