她在浴室里用丝瓜络轻轻擦洗背部。

She gently scrubs her back with a ___loofah in the shower.

她用丝瓜络轻轻擦洗背部，感觉比普通海绵更舒服。

She gently scrubs her back with a ___loofah, which feels more comfortable than a regular sponge.