Knife-edges
n. 刀刃；锐利物；处于紧要关头；十分焦虑
🧩 词语组成解析
knife
[naɪf]
n. 刀;匕首;刃部;手术刀;
vt. 切割，刺;伤害;
vi. 劈开;划过;
n. 边界；边缘；优势（edge的复数）
🗣️ 情景例句
He's always trying to pick up on me.
他总想调戏我。
Would you mind mailing this letter for me?
你介意寄我的这封信吗？
because the environment that determines our evolution is no longer essentially physical.
因为决定我们进化环境的主要方面已不再是物质。