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本題に入る， ほんだいにはいる
1. to get to the main subject, to move on to the main topic, to get down to business
tbd
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本題， ほんだい
1. main topic, main subject, main issue, main question
2. this subject
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