commence
单词辨析：
指动作开始且持续下去，强调开始这一事实。
The yacht will start its maiden voyage next week.
这艘游艇将于下周开始它的处女航。
They were starting to skate.
他们正开始滑冰。
Wet the clay a bit more before you start to mould it.
把泥弄湿点再动手塑形。
最常用词，指为某一过程或进程开个头，常可与 start 换用。
They began/started to work.
他们开始工作了。
The class began/started with a story.
这节课是从一个故事开始的。
When did you begin/start learning Japanese?
你何时开始学习日语的？
指开始某种正式行动，常伴有正式程序或一定的仪式，语气庄重。
When will the opening ceremony commence?
开幕式什么时候开始?
They'll commence building next week.
他们下周破土动工。
Further negotiations on services will commence in 2012.
服务业的进一步谈判将于2012年开启。
以上这组词作为瞬时动词，通常不可与表示一段时间的状语连用。
相关例句：
Then he would wait no longer, but flew away, to commence his wooing at once.
当他从她得不到半个字的回答的时候，就不再愿意问了。他飞走了，并且立刻开始他的求婚活动。
When you've finished your talking I shall commence!
等你结束你的谈话，我再开始！
After the start-up time of the dryer, purging of the system may commence.
过了干燥器的预运行时间，可以执行吹扫。
The event was about to commence and we could feel the rush of anticipation surrounding us.
比赛就要开始了，我们都非常兴奋，也能感觉到大家对我们的热切期望。
They commenced a systematic search
他们开始进行彻底搜查。
The hunter knelt beside the animal carcass and commenced to skin it.
猎人跪在动物尸体旁边，开始剥皮。