the streamlines of sth
常用复数，指某一流场中的多条流线；of 后接具体的流体或风。
The streamlines of the airflow curve sharply around the wing.
气流的流线在机翼周围急剧弯曲。
与流体流动速度相切的线；等同于该流动中特定粒子的路径；在天气图上,与风流动相切的线；流线型
A line tangent to the velocity of a flowing fluid, equivalent to the path of a particle in that flow.
与流体流动速度相切的线；等同于该流动中特定粒子的路径
A line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow.
在天气图上,与风流动相切的线
On a weather chart, a line that is tangent to the flow of the wind.
The engineer drew a streamline to show how the water moves around the bridge pillar.
工程师画了一条流线，以显示水如何绕桥墩流动。
用法提示：此处 streamline 是名词，表示流体中表示流动方向的线。
Each streamline on the weather chart represents the path that the air follows at that moment.
天气图上的每一条流线都代表那一刻空气所沿的路径。
用法提示：streamline 为名词，在气象图中指与风向相切的线。
By following the streamlines in the wind tunnel, the students could see the airflow around the wing.
通过观察风洞中的流线，学生们可以看到机翼周围的气流。
用法提示：streamlines 是 streamline 的复数形式，指多条表示流体运动的线。
常用复数，指某一流场中的多条流线；of 后接具体的流体或风。
The streamlines of the airflow curve sharply around the wing.
气流的流线在机翼周围急剧弯曲。
介词 along 表示顺着流线的方向；streamline 前常加不定冠词。
The pressure drops steadily as you move along a streamline.
沿流线移动时，压强平稳下降。
用于定义流线时的典型说法，tangent to 后接速度或方向。
At every point a streamline is tangent to the direction of the flow.
在每一点上，流线都与流动的方向相切。
grammar · medium
易错句子Streamline is a line tangent to the velocity of the flow.
正确表达A streamline is a line tangent to the velocity of the flow.
streamline 作此义时为可数名词，单数形式作主语前必须加不定冠词 a；汉语名词前不需冠词，学习者容易整句省略。
grammar · medium
易错句子The weather chart shows many streamline.
正确表达The weather chart shows many streamlines.
many 修饰可数名词时必须接复数形式，故用 streamlines；汉语名词本身不标复数，学习者常漏掉词尾 -s。
grammar · medium
易错句子The streamlines which tangent to the wind flow are drawn on the chart.
正确表达The streamlines which are tangent to the wind flow are drawn on the chart.
tangent 是形容词，不能单独充当谓语，定语从句中须补出系动词 are；汉语形容词可直接作谓语，学习者常因此漏掉 be 动词。
streamline 是与流速相切的几何线（流线），只有在定常流动中才与粒子轨迹重合；trajectory 是粒子实际运动的路径，在非定常流动中两者不同。
在天气图上，streamline 是与风向相切的线（流线），表示风向；isobar 连接气压相等的点（等压线），表示气压分布。两者都是天气图上的线，但描述的量不同。
stream 指流动的流体本身（如一股水流或气流），而 streamline 指与流速方向相切的几何线，不指流体本身。
adj. (streamline + -ed)
n. (streamline + -ing)
n. (streamline + -er)
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