Poly(hexamethylene adipamide)
[化] 聚己二酰己二胺; 尼龍-66
??? 情景例句
How much does it weigh?
它多重？
Why not go out for a walk?
干嗎不出去散步？
When we talk about the universe, we mean the earth, the sun, the moon and the stars, and the space between them.
人們談?wù)撚钪鏁r，是指地球、太陽、月亮、星星以及它們存在的空間。