... pretending to be serious 煞有介事地; take for serious当真 in private 秘密地;私下地; ...
双语例句
1
After a serious argument, it can take some time for the wounds to heal.
激烈争吵之后的感情创伤需要一些时间才能愈合。
《牛津词典》
2
Children and teens with a cold or flu should not take aspirin for pain relief because of the risk of Reye syndrome, a rare but serious condition of the liver and central nervous system.