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Snowy owls' plumage (feathers) can vary from pure white to brown. Photo: BBC
Snowy owls use their white feathers to reflect sunlight, warning rivals of their presence, according to researchers at the University of Saskatchewan in Canada and the Museum of Natural Sciences in Spain.
加拿大薩斯喀徹溫大學和西班牙自然科學博物館的研究人員說雪鴞用自己雪白色的羽毛來反射陽光向敵人發出警告，表明自己的存在。
如果我們說某人 stands tall 很神氣地站在那兒，意思就是說此人滿懷自信、自豪。
Our athletes stand tall after winning many gold medals at this year's Olympics.
The critics thought the movie was awful, but its director stands tall as he heads for tonight's Oscars ceremony.
短語 a tall order 的意思是難以完成的任務、苛求。
My teacher wants me to write three essays for next week. That's a tall order!