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時々， 時時， 時どき， ときどき
1. sometimes, occasionally, at times, from time to time, now and then, once in a while, at intervals
2. seasonal, of the season, appropriate (for the season or occasion)
有时，偶尔，间或，不时，时而；季节性的；属于某个季节的；适合(某个季节或场合的)
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落ちる， 墜ちる， 落る， おちる
1. to fall, to drop, to come down, to crash, to collapse, to cave in, to give way
2. to set (of the sun or moon), to sink, to dip, to go down
3. to decrease (of popularity, quality, speed, sales, etc.), to fall, to drop, to go down, to decline, to de...
坠落，掉落，落下，坠毁，坍塌，塌陷，倒塌；落(日、月)，下沉，下行；下降；进账；投射(光线、阴影、目光等)
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
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
