它是物质交换的有效阻隔并防止皮肤干燥。
It is an efficient obstacle to material exchange and avoids the skin's drying out.
支持细胞在生精细胞发育中，处于信息和物质交换的中心地位。
The sertoli cell is the central point of exchange information and material.
恒星是一个不断地与外界发生能量和物质交换的远离平衡的开放系统。
A star is an open system that exchanges energy and matter with its exterior.
问题出在我们总是把送礼物当成是物质品交换的过程。
The problem is that we think about giving gifts as the exchange of physical objects.
问题出在我们总是把送礼物当成是物质品交换的过程。
The problem is that we think about giving gifts as the exchange of physical objects.
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