counter mark
在胃黏膜下标记到副交感神经元；
Parasympathetic neurons were labeled below gastric mucous membrane.
youdao
每一副十字绣图纸上都有以符号或者色标记的线标，不同的线标代表不同的绣线。
Each pair of cross-stinch drawings have to sign or color mark line, different line represents different enmbroindery thread.
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