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.
She rubbed the key on a stone, but she could not rub the mark away.
她用石头去磨钥匙，但是仍是无法抹掉这个印记。
3
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.