如果要区分从上部和下部之间的面部毛发，胡子不包括胡髭，即长在上唇上面及周围的毛发。
When differentiating between upper and lower facial hair, a beard specifically excludes the moustache, which refers to hair above the upper lip and around it.
一个在上面那个不渗透层的上部，另一个在两个不渗透层之间。
One is on top of the upper non-porous layer, the other is between the two non-porous layers.
当一个仪器堆积在另一个仪器上面时，由于下面较低部分产生的热量会干扰上部仪器的操作，在这个时候对于室温的控制就要求特别苛刻。
Control of ambient temperature is particularly critical when one apparatus is stacked above another, because the heat generated from the lower unit can interfere with the operation of the units above.
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