- 下流: lower reaches
- 的: 4次方是 The fourth power of 2 i ...
- 玩笑: joke; jest
- 下流的: barbarous; billingsgate; blue; brutal; caddish; downstream; fescennine; four-letter; fourscore; ignominious; improper; indecent; indelicate; low-minded; mechanical; of vileness; ribald; scummy; scurrilous; scurvly; scurvy - above reproach; sordid; underbred; ungentlemanly; ungraceful
- 恶意的玩笑: practical jokes
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