- 通常: general; usual; normal
- 约: 1个月 about a month
- 通常: general; usual; normal 通常情况下 under normal conditions; 我通常 6点钟起床。 i generally [usually] get up at six o'clock
- 定常约束: constraint independent of time; scleronomic constraint
- 非定常约束: constraint dependent of time; rheonomic co traint; rheonomic constraint
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