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困難， こんなん
1. difficulty, hardship, trouble, distress
2. infeasibility, inability (to carry out)
困难；不可行性，无能为力（执行）
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陥る， 落ち入る， おちいる
1. to fall into (e.g. a hole)
2. to fall into (chaos, depression, dilemma, illness, etc.)
3. to fall into (a trap, etc.)
4. to fall, to surrender, to capitulate
掉进（例如一个洞里）；陷入（混乱、抑郁、困境、疾病等）；落入（陷阱等）
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