B2 a line of light that shines from a bright object光线;光束;光柱
a line of radiation or particles flowing in one direction(定向发出的)射束,粒子流
a long, thick piece of wood, metal, or concrete, especially used to support weight in a building or other structure(尤指支撑建筑物或其他结构的)梁,桁架,栋梁
in the sport of women's gymnastics, a wooden bar on which the competitors balance and perform movements(女子体操运动中的)平衡木
[ I ] to smile with obvious pleasure高兴的微笑,眉开眼笑
[ I or T ] to send out a beam of light, an electrical or radio signal, etc.辐射;发光;闪光;发射电波;播送
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