Prepaying
v. 预付, 先付( prepay的现在分词 ); 预付（邮资等）
🗣️ 情景例句
I never realized that.
我从来没有意识到这点。
He who rides a tiger is afraid to dismount.
骑虎者难下。
Speculations about is nature have been going on for literally thousands of years,
人们对睡眠作用的种种猜测，确实有数千年之久。