77. 如果這面牆總是暴露在陽光及雨水下，上面的油漆很容易就會脫落了。If the wall is exposed to the sunlight and rain all the time, its

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77. 如果這面牆總是暴露在陽光及雨水下，上面的油漆很容易就會脫落了。If the wall is exposed to the sunlight and rain all the time, its paint will _____________ _____________ easily.