Polynonanoylamide
[化] 聚壬酰胺; 尼龍-9
??? 情景例句
Well, it's small, but clean.
噢， 它是小了點， 但是干凈。
All bags contain an inner waterproof lining.
所有包內都有一層防水內襯。
She sang perfectly in the hall last night.
她昨晚在大廳唱得非常好。