Grenz rays
[医] 境界[射]线(很软的X线,其波长约为2埃单位)
🗣️ 情景例句
I wish Michelle and her friends would get here.
我希望 Michelle和她的朋友很快就到这 。
He already has a phonograph,but he doesn't have a radio yet.
他已经有一架留声机,但是他还没有收音机。
In 1858, a French engineer, Aime Thome de Gamond, arrived in England with a plan for a twenty-one-mile tunnel under the English Channel.
1858年,一位名叫埃梅。托梅。德。干蒙的法国工程师带着建造一条长21英里、穿越英吉利海陕的隧道计划到了英国。
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