名词
中文翻译：时间阶段
同义词：
['period', 'time period']
例句：
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1.The scientist has been working on this project for the past three years.
这位科学家过去三年一直在做这个项目。
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2. Time is a valuable resource that we should not waste.
时间是一种宝贵的资源，我们不应该浪费。
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3. During his time phase, he made significant contributions to the field of science.
在他的时期，他为科学领域做出了重大贡献。