该地区去年见证了显著的经济增长。
The region ___saw significant economic growth last year.
该国去年见证了可再生能源投资的显著增长。
The country ___saw a significant rise in renewable energy investment last year.
20世纪见证了全球范围内巨大的社会和政治变革。
The 20th century ___saw tremendous social and political changes across the globe.
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