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單元4. Tricky Words（容易混淆的字詞）
In front of VS. At the front of
● in front of
英解：close to the front part of something
解釋：在……前面，不同範圍
◆ 例句：The car is in front of the bus. （汽車在公車前方。）
● at/in the front of
英解：in the front part of something
解釋：指某一範圍以內的前面
例句：They stood at/in the front of the line.（他們排在隊伍的前面。）◇
