重點講解：
1.as far as we know 據我們所知；正如我方所知
例句：And as far as we know, the rates they quote are among the most competitive in the line.
據我們所知，他們的價格是業內非常有競爭力的。

2.the key to ...的關鍵
例句：The key to our success in the fight was that we knew the enemy's attacking routes in advance.
戰斗勝利的關鍵在于我們很早就獲知了敵方的進攻路線。

3.just right 正好；剛剛好
例句：First, he said the flesh was just right, not too firm and not too soft.
肉剛剛好，既不太嫩又不太老。

4.pay it a visit 親自拜訪
例句：The only thing the road cares about is that you pay it a visit once in a while.
這條路唯一在乎的是，你時不時來光臨一次。