为什么[l]和[r]遇到[s][p][t][k]之后就从voiced变成voiceless了?In English,the sounds [l] and [r],which are usually voiced,are voiceless when they follow [s][p][t][k],as in slay,pray,tray,clay. 这是为什么?
1. The phrase not at all is sometimes used as a
polite response when someone thanks you. (《韦氏高阶英汉双解词典》p.54)
not at all这个短语有时候用作某人感谢你时有礼貌的应答方式。“Thank you for all your trouble.”“Not at all.”“谢谢,让你费心了。...