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たまたま， 偶々， 偶偶， 偶， 適
1. by chance, by accident, accidentally, happen to (be, do), unexpectedly, casually
2. occasionally, once in a while, now and then
tbd
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
そこ， 其処， 其所
1. there (place relatively near listener)
2. there (place just mentioned), that place
3. then (of some incident just spoken of), that (of point just raised)
4. you
tbd
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd
