as it should be by rights (idiom); proper and to be expected as a matt
理 · 11 strokes
Phonosemantic compound. 𤣩 represents the meaning and 里 represents the sound.
所 · 8 strokes
Origin unclear. 戶 represents the sound.
当 · 6 strokes
Phonosemantic compound. 田 represents the meaning and 尚 represents the sound. The simplified character 当 was adapted from the cursive form of the traditional character 當.
然 · 12 strokes
Phonosemantic compound. 灬 represents the meaning and 肰 represents the sound. Based on the original meaning "burn", now written as 燃. The current meaning is a phonetic loan.
这理所当然是你应该做的。
as it should be by rights (idiom); proper and to be expected as a matter of course; inevitable and right