名词
中文翻译：千分之一
同义词：
['parts per million', 'parts per billion']
例句：
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1. The company's stock price has dropped by part per million since the announcement.
自从宣布以来，该公司的股票价格已经下跌了千分之一。
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2. The scientist found a new species of plant that can grow in part per million of sunlight.
科学家发现了一种新植物，能在千分之一的阳光下生长。
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3. The team was able to complete the project within part per million of the estimated timeline.
团队能够在预计时间线的基础上完成项目，节约了百分之一的时间。