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沈む， しずむ
1. to sink, to go under, to submerge
2. to go down (e.g. sun), to set, to descend
3. to feel depressed, to become subdued, to become somber
下沉，沉没，淹没；感到沮丧，变得低落，变得阴郁
が
1. indicates the subject of a sentence
2. indicates possession
3. but, however, (and) yet, though, although, while
4. and
5. used after an introductory remark or explanation
6. regardless of ..., whether ... (or not), no matter ...
7. indicates a des...
tbd
