【几个中国成语的英语表达】 大快朵颐eat one's fill/gorge oneself; 大海捞针look for a needle in a haystack; 大智若愚still waters run deep; 口若悬河talk nine words at once; 口是心非 speak with one's tongue in one's cheek; 口腹蜜剑a honey tongue, a heart of gall；人之常情human nature ​