All at once, Mick's serious expression softened into a grin.米克严肃的表情一下子变成了笑脸。Jeremy grinned broadly before he remembered himself and assumed a serious expression again.杰里米咧开大嘴笑了笑，意识到自己失态，旋即又摆出一副严肃的神情。He was wearing a very serious expression and I knew something was wrong.他一脸严肃，我就知道出问题了。