平直 meaning in Chinese

flatten
rectified shoreline

No gray hairs are in the even, smooth blackness .
一头平直光润的黑发里，没见到一丝灰白。
When this tensor vanishes, the space is calleda flat .
当这一张量为零时，空间叫做平直空间。
If you wanted me to go why did not you say so in plain english instead of making vague hints ?
你想叫我走，为什么拐弯抹角而不用平直的英语？
On air photographs, fault indications have one common property: they are always straight, or slightly curved .
在航空相片上，断层标志有一个共同的特点，就是它们始终是平直的或轻微弯曲的。
Experiment study on tension control of strip flatness
带材平直度的张力控制实验研究

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