Polyster
聚酯，聚脂纤维
🗣️ 情景例句
It is.
它是的。
It'll soon go out of mind.
这件事很快会被忘记。
Speculations about is nature have been going on for literally thousands of years,
人们对睡眠作用的种种猜测，确实有数千年之久。