Polyanhydrides
[化] 聚酐类
🗣️ 情景例句
and I think
我觉得
My book has a dark blue cover.
我的书有一个深蓝色的封面。
Be careful! Don't throw your cigarette out of the window. If you do that, you may start a fire. Put it out in the ashtray.
当心！别把香烟丢到窗外。要是你那样做，会引起火灾的。把它熄灭在烟缸里。