油漆滚筒涂抹着鲜艳的蓝色油漆。
The paint ___roller is applying bright blue paint.
她用滚轮放松紧绷的大腿肌肉。
She used a ___roller to loosen tight thigh muscles.
巨大的海浪把我们的船高高抛向空中。
The huge ___roller lifted our boat high into the air.
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