Tetrapion
四氟丙酸钠
🗣️ 情景例句
I'm as strong as an ox.
我像牛一样壮。
On a crowded train, one comes in contact with many people.
在拥挤的火车里面，会和许多人接触。
It's too hard. Oh, dear! Is it broken?
太难了，天那！风筝被弄坏了！