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一面， １面， いちめん
1. one face, one surface
2. the whole surface
3. one aspect, one side
4. (on) the other hand
5. one broad, flat object
6. front page (e.g. newspaper)
整个表面；头版(例如报纸)；一面，一个表面；一个方面，一面
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
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
