（光等）快速移动，闪现，浮现 A smile played across/around/on his lips. 他的唇角闪过一丝微笑。 It really is best not to do something. Here, we possess the adjective best, but this adjective is attached to no noun. The adjective best is used in a copular construction Together with the dummy pronoun it. This pronoun doesn't check with https://franciso578jhz6.wikienlightenment.com/user