Saltpeter
n. 硝石, 硝酸钾, 硝酸钠\\n[化] 硝石
✅ 同义词
🗣️ 情景例句
If you want to go sightseeing, a ferry trip is usually pretty cheap.
如果你想观光，坐船通常是比较便宜的。
Life without a friend is death without a witness.
在世无朋友，死后无证人。
The man who had fixed up the air-line was also questioned.
安装供气管的那位工人也被提问。