V-T/V-I When something commences or you commence it, it begins. 使…开始; 开始 [正式]
The academic year commences at the beginning of October.
该学年于10月初开始。
They commenced a systematic search.
他们开始了系统的搜查。
When the lemmings' food supply becomes too low to support the population, a singular migration commences.
当旅鼠的食物供应不足以维持种群时，一次特别的迁徙就开始了。
However, when the lemmings' food supply becomes too low to support the population, a singular migration commences.
然而，当旅鼠的食物供应变得太少而无法维持种群时，一次特别的迁徙就开始了。
During the Maastrichtian, a regression commences.
在马斯特里赫特时期，回归开始了。
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