一,if I were you,Id let her cool off a few days before I approach her.
Well此處起到語氣詞的作用，相當於嗯，呃，暗示語氣有輕微轉折。Id是I would的省略形式，意為我會。其中的would主要是強調主觀的.意願，而非對時態進行暗示。
cool off此處意為冷靜下來，鎮靜下來，該短語還含有使某人感到涼快;冷卻之意。如
Drink some cold water to cool yourself off.
喝點涼水，涼快涼快。
before本意是在以前，此處是指先再。approach此處意為接近。
英語六級考點歸納：
在口語中與cool相關的短語還有：
cool down意為使冷靜;漸漸冷卻。如:
Housing market continues to cool down.
房地產市場繼續降溫。
keep cool意為保持涼爽;保持冷靜，保持沉著。如:
You should keep your cool in the heat of competition.
在激烈的競爭中，你應該保持沉著冷靜。
lose ones cool意為無法自制，失態。如:
By the end of the game, the coach had Iost his cool。
比賽結束時，教練失態了。
as cool as a cucumber意為非常冷靜，泰然自若。如:
