在线词典理所当然当然:应当如此。按道理应当这样。拼音lǐ suǒ dāng rán解释当然:应当如此。按道理应当这样。近义词天经地义、不容置疑反义词不以为然、岂有此理英文释义as it should be by rights (idiom); proper and to be expected as a matter of course; inevitable and right