单语范例（未经PONS编辑处理）
英语
- They are often used as a tracer dye within water to determine the rate and direction of flow and transport.en.wikipedia.org
- It is often used as a tracer dye within water to determine the rate and direction of flow and transport.en.wikipedia.org
- The direction of flow of these signals is opposite to that in which user information is being transferred.en.wikipedia.org
- Many hand pumps will allow the passage of fluid through them in the direction of flow and diaphragm pumps are particularly good at this.en.wikipedia.org
- The bridge has a series of overhead gantries which indicate the direction of flow for each traffic lane.en.wikipedia.org
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英语