Santocel
硅酸盐
🗣️ 情景例句
Practice tenses as much as possible.
操练各种时态。
I must play my spare time well, or I end up doing nothing.
我必须善于利用空闲的时间，否则生命将会在无所事事中告终。
This bedroom's very untidy.
这卧室太不整洁了。