重点讲解：
1. put in 花费，投入（时间或精力）；
例句：They've put in time and effort to keep the strike going.
他们花费了很多时间和精力以使罢工持续下去。
2. chop up 切碎；剁碎；
例句：Chop up three firm tomatoes.
拿3个硬西红柿切碎。
3. by hand 用手工；
Each pleat was stitched in place by hand.
每条褶裥都是手工缝制到位的。
4. stick to 黏附；附着在；
例句：Peel away the waxed paper if it has stuck to the bottom of the cake.
如果蜡纸已粘在蛋糕的底部，就把它撕掉。

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