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重労働， じゅうろうどう
1. heavy labor, heavy labour, hard work
2. hard labor (in prison), hard labour
tbd
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慣れる， 馴れる， なれる
1. to get used to, to grow accustomed to, to become familiar with
2. to become skilled in, to become experienced at
3. to become tame, to become domesticated
4. to get used to doing
习惯于，逐渐习惯于，熟悉于；精通于，熟练于；变得驯服，变得家养；习惯于做某事
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
