✔ 最佳答案
1.畫蛇添足:
a. to draw a snake and add feet to it
b. to ruin the effect by adding sth.; to gild the lily
2.先斬後奏:
a. to order execution of criminals first and report to the emperor afterwards; to act first and report afterwards
3.各有千秋:
a. Each has specialized skills
4.覆水難收 :
a. Spilt water can't be gathered up.
b. What is done can't be undone.