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.
中国美学的主脉中也没有这个思想。
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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