这些词本身就为我们提供了何时可以恰当使用它们的线索。
The words themselves offer the clue as to when best to use them.
从小在双语环境下长大的孩子必须关注社交线索，以弄明白在什么环境下与什么人交流该使用哪种语言。
Young children being raised bilingual have to follow social cues to figure out which language to use with which person and in what setting.
拉皮塔人几乎没有留下任何关于他们自己的宝贵线索，但艾菲特岛极大地增加了可供研究人员使用的数据。
The Lapita left precious few clues about themselves, but Efate expands the volume of data available to researchers dramatically.
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