正对主脉的上表皮凹陷处均有泡状细胞。

The bulliform cells were situated in groove of upper epidermis facing the main vein.

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中国美学的主脉中也没有这个思想。

Chinese aesthetics is not the main vein of this idea.

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定时器是雷达系统的重要部分，它为雷达全机提供所需的各种主脉冲定时信号和波门定时信号。

Timer is an important part of Radar system, it affords system all the AP timing signals and wave gate timing signals.

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