Polycarboxylic
[机] 多羧酸的
🗣️ 情景例句
will read a poem by Robert Frost.
要朗读Robert Frost作的一首诗。
Please fill in this disembarkation card.
请你填写这张入境卡。
Though in those days, traveling was not as easy as it is today,
尽管在当时旅行不像现在这么容易，