knack 美 [ næk ]
n. 诀窍，窍门 熟练技术，技巧 需要技巧的工作 巧妙手法

1.She has a knack of landing herself right in the soup.
她老是让自己的处境很尴尬。
2."I have a knack for making friends, you know," she added meaningfully.
“你知道，我交朋友有一套的，”她故意补充说。
3.It's easy, once you've got the knack.
你一旦掌握这个技能就容易了

knock

1.Find Bernie and get him to knock an agreement together.
找到伯尼，让他尽快拟好一份协议。
2.They decided to knock the two rooms into one.
他们决定把两间屋子打通连成一间。
3.What they said was a real knock to my self-confidence.
他们的话是对我自信心的一次重大打击。