through four procedures—bidding, BIE enquiry, voting, and registration , which span several years.
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which span several years
持续了好几年
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Xiao Luo: It's true! Application for hosting a World Expo shall go through four procedures-bidding, BIE enquiry, voting, and registration, which span several years.
小罗：是的！申办世博会需要完成申办、考察、投票和注册四项程序，前后历经数年。
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