举例子:科学家提出许多设想,例如,在火星或者月球上建造移民基地.
列数字:地球是一个半径只有六千三百多千米的星球.
做比较:同茫茫宇宙相比,地球是渺小的.
打比方:塞特凯达斯瀑布在群山之间无奈的垂下了头,想成命垂危的老人,形容枯槁,奄奄一息.
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