walk * back +
撤銷；撤回；收回
The president walked back his initial comments in the press conference. (總統在記者會上收回他最初的評論)
walk back from +
撤銷；撤回；收回
The dangerous criminal walked back from his confession. (那個危險的罪犯翻供了)
ward * off +
避開；阻止；擋住
A lot of people take vitamin C to ward off colds in the winter. (冬天時許多人服用維他命 C 來預防感冒)
I was given a charm to ward off evil spirits. (我得到了一個護身符，可以驅鬼避邪)
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