Whets
v. （在石头上）磨（刀、斧等）( whet的第三人称单数 ); 引起, 刺激（食欲、欲望、兴趣等）
🗣️ 情景例句
No...I can't remember taking pictures of people exercising.
没有 ……我好像没有拍过人们练健身操的照片。
Who cares!
我不在乎！
It is fairly clear that sleeping period must have some function,
很清楚，睡眠必然具有某种作用。