he always looks serious and never laughs他的: his表情: expression; countenance; loo ...总是: always; invariably严肃: serious; solemn; earnest的: 4次方是 The fourth power of 2 i ...下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:他的表情总是严肃的，即可在微信中查询翻译
