Prefocus
vt.使預先聚焦, 預先調節…的焦距
??? 情景例句
You must observe these simple rules.
你必須遵守這些簡單的規定。
Either win the horse or lose the saddle.
不是全贏，就是全輸；孤注一擲。
Snakes did not acquire their poison for use against man but for use against prey such as rats and mice, and the effects on these of viperine poison is almost immediate.
因為蛇有毒液不是用來對付人的，而是對付它的獵物，諸如鼠類，毒液對這些獵物會立刻起作用。