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Nonstop waves of immigrants played a role, too---and so did bigger crops of babies as yesterday's "baby boom" generation reached its child-bearing years.
该句话中so did位于句首,...也如此,是部分倒装结构,did相当于前边句子的谓语played a role;as连词,随着,引导时间状语从句,主语是yesterday's "baby boom" generation ,位于是reached。宾语是 its child-bearing years。参考翻译:大量流动的移民也扮演了重要角色,并且随着昔日“婴儿潮”一代也到了孕育的年龄,大批即将到来的婴儿也同样扮演着重要角色。
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