崖沙燕是一种腹部为白色的褐色的鸟。

The sand martin is a brown bird with white underneath.

《柯林斯英汉双解大词典》

王燕从6岁就开始为全家人做饭和洗衣服。

From the age of 6, Wang Yan began to cook and wash clothes for the whole family.

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他解释到，燕鸥的飞行路线是以大气中螺旋风为根据，他们要尽量避免被风卷走。

The birds appear to be following huge spiraling wind patterns in the atmosphere, avoiding flying into the wind, he said.

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