Paramutualism
兼性互惠共生
🗣️ 情景例句
What's this about, Harvey?
这是怎么回事 Harvey
The history paper was really easy, so was the biology one.
历史试题确实容易，生物试题也很容易。
You need to wear lots of warm clothes.
人们要穿很多的保暖的衣服。