1. C 梁，横梁　a large long heavy piece of wood used to support a building or to go from one side of a ship to the other
2. C 定向无线电波；光线；光束　radio waves sent out along a narrow path in one direction only
3. C 笑容，喜色　a bright look or smile

　beam　通常指“光束”，即从发光体向某方向射出的有一定宽度的光线，尤指定向的无线电波。

　direct a ～ at　把光束射向…
　fly the ～　按照无线电波飞行
　shine a ～ at　对…射出光束
　electronic ～　电子光束，电子柱
　glorious ～s　灿烂光辉
　high ～　远光
　invisible ～s　看不见的光束
　low ～　近光
　main ～　正梁
　balance ～　天平的横杆
　radar ～　雷达波束
　radio ～　无线电波
　off (the) ～　脱离航向，不对头，做错
　on the ～　沿正确方向
　with a ～ of delight　高兴地，带着微笑
　～ from　来自…的光线
　～ of light　一道光线，光束
　～ to　射向…的光线

　Beams support the roof of a house.　横梁是用来支撑屋顶的。
　There I saw the glorious beams of the rising sun.　在那里我看见了初升太阳的光芒。
　Beams of light came through the cracks in the wall.　束束光线透过墙上的裂缝照进屋里。
　"How nice to see you!"she said, with a beam of welcome.　“很高兴见到你！”她笑迎着说。

 ♣ off (the) beam
　〈口〉偏离无线电波指示的航道；不对头 off course; lacking precision
　The inexperienced pilot flew the plane badly; it was off the beam most of the time.　那位没有经验的飞行员驾驶技术很差，飞机大部分时间都偏离了无线电讯号指示的航道。
　I've come to realize what I said at the meeting was off beam.　我已经了解到我在会议中所讲的话是错误的。
 ♣ on the beam
　正确　correct
　His answer was on the beam.　他的答案正确。

 ♣ beam, ray
　参见ray条。

1. vi.发出光与热　 (of the sun, etc.) send out light and warming
2. vt.播送　 broadcast (a message, radio programme etc.) in a particular direction
3. vt. & vi.面露喜色　 smile happily and cheerfully

　～ brightly　发出明亮的光
　～ intermittently　间歇性地发出热和光
　～ steadily　稳定地发出无线信号
　～ chastely　善良地微笑
　～ genially　亲切地微笑
　～ graciously　和善地微笑
　～ sunnily　阳光灿烂般地微笑
　～ at　使…对准
　～ from tower to tower　从一塔向另一塔发射
　～ in the distance　在远处闪耀
　～ on one's friend　朝着朋友微笑
　～ with broad smile　笑容可掬
　～ with joy　笑逐颜开

　The moon is beaming overhead.　月光当头照。
　The teacher beamed at the students.　教师向着学生们微笑。
　The old man sat there beaming on the children.　老人坐在那儿对孩子们微笑。
　Her face beamed with joy.　她面露喜色。

　He beamed a cheerful welcome as he opened the door.　他打开门，笑笑，表示欢迎。

 ♣ beam to　(v.+prep.)
　向（某地）播送（广播或电视节目）　broadcast (a radio or television message) to (a certain place)
　They beamed the program to the countries of Central America.　他们向中美洲国家播送这套节目。
　The radio station agreed to beam the Minister's speech to the whole Europe.　广播电台同意对全欧广播该大臣的讲话。
　The news was beamed to East Africa by satellite.　新闻通过卫星向东非广播。
　This programme is beamed to Australia and New Zealand at 12:00 daily.　本节目每天12点向澳大利亚和新西兰播送。

 ♣ beam, chuckle, giggle, grin, laugh, smile, sneer
　参见laugh条。

　［同义词］ n. brace, gleam, ray, width
　［词源］中古英语beam（树，光束）