196. X-ray ['eks'rei]
n. X射线,X光
参考例句
1. X-rays can pass through some solid materials. 
X射线能够透过某些固体物质。
2. Surgery now utilizes X-rays. 
现在外科使用X光。
3. Go and have your chest X-rayed. 
去X 光透视一下你的胸部。
4. To irradiate with x - rays. 
用X射线照射

197. yard [jɑ:d]
n. 码,庭院,工作场
词形变化
时　态：yarded, yard?ing, yards
常用短语
1. cubic yard 
n. 立方码
2. yard sale 
旧家具旧衣物的拍卖
3. main yard 
n.主帆的帆架,大桅的桁
4. marshalling yard 
编组车场，排组站
5. side yard 
侧院
6. square yard 
平方码，平方英码
7. yard measure 
码，码尺
8. yard goods 
n.按码出售的织物,匹头
9. railway yard 
铁路站场
参考例句
1. The merchant is giving half a yard extra for lagniappe. 
那商人打算免费附赠半码。
2. The part of a yard between the slings and the yardarm. 
吊索与桁端间的一码的部分
3. Two yards will be ample. 
两码足够了
4. She guessed that she was 50 yards from shore. 
她推测她离岸有50码远。
5. Step off ten yards. 
步测出十码
6. Spread the grass seeds over the yard. 
把草籽撤在院子里。
7. My grandma feeds a lot of chickens in her yard. 
我的奶奶在院子里养了许多小鸡。
8. GarBage that stinks up the yard. 
使整个庭院发臭的垃圾

198. yoghurt: [ 'j?g?t,'j??- ]  
n. 酸乳酪
词形变化:
异体字:yoghourt
参考例句：
1.  This yoghurt contains no artificial flavouring or colouring. 
    这种酸乳酪不含人造香料或著色剂.
2.  I like drinking creamy yoghurt in summer. 
    我喜欢在夏天喝些酸奶。