它是由胚胎时的前三个神经原节愈合而成的。
It is formed by the coalescence of the first three neuromeres in the embryo.
活动的筹办方原预计会有近3000对双胞胎——共4万余人，参加第31届双胞胎节。
Festival organizers expected nearly 3,000 sets of twins — and more than 40,000 people overall — to attend the 31st event.
活动的筹办方原预计会有近3000对双胞胎——共4万余人，参加第31届双胞胎节。
Festival organizers expected nearly 3, 000 sets of twins — and more than 40, 000 people overall — to attend the 31st event.
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