wipe away:（指用抹布、手等）擦去,抹去（尘土、水等）
例如：She wpied away their childish tears.她擦去了他们孩子似的眼泪.
She used a wad of tissues to wipe away the blood.她用一叠薄纸擦去血迹.
rub out:（指用布或橡皮）擦掉（印迹、字迹、污迹等）
例如：The ink won't rub out.这种墨水擦也擦不掉.
She tried to remove the mark from his jacket with a cleaning fluid,but it wouldn't rub out.
她试图用清洁剂来除他短上衣上面的污痕,但搓洗不掉.