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Source: Bureau of Labor Statistics, Current Population Survey.
文中词汇表达比较多样，能多用学术词汇就更好了；句式变化多样；全文结构较为严谨，应适当增加文中衔接词的使用。
This is a real story. Once upon a time, in winter,a plane was crashed a mountain and the pilot was dead, but there is a woman and her two baby, who was survived. There is a desolate area that none can find them. At night, temperature is taper and the mother take off her coat to warm the babies, the wind is so bitterly that the mother want to get into the tent, but it is too small to get in. At second day morning, the woman hear a helicopter fly upon her, so she scream loudly to let the pilot hear her, but it doesn't work. Then she stamps a "SOS", fortunately the helicopter pilot discovered it and telephoned the nearest town to rescue them.
