keep calm沉住气;平心静气保持冷静;保持镇定;镇静。Try to keep calm and just tell me what happened.镇静点,告诉我出了什么事。keep calm是什么意思keep calm的意思是:保持冷静;安静calm:adj.镇静的;...
液体张力怎么计算
七上八下的反义词是什么