Biologists also noted deer sniff and lick an unfamiliar rub, which suggests that this visual mark on a small tree plays an important communication purpose in the social life of deer.
生物学家也注意到鹿会嗅和舔陌生的擦痕，这表明小树上的这种视觉标记在鹿群的社会生活中起着重要的交流作用。
She rubbed the key with a cloth, but the mark did not go away. She washed the key in hot water, but the mark was not washed away. She rubbed the key on a stone, but she could not rub the mark away.
她就用布去擦钥匙上的记号，但是擦不掉，她用热水洗钥匙，记号还是洗不掉，她又在石头上磨钥匙，可是记号仍旧去不了。
She tried to remove the mark from his jacket with a cleaning fluid, but it wouldn't rub out.
她试图用干净剂来除他短上衣上面的污痕，但搓洗不掉。
She tried to remove the mark from his jacket with a cleaning fluid, but it wouldn't rub out.
她试图用干净剂来除他短上衣上面的污痕，但搓洗不掉。
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