... 直准线 rectilinear directrix 直无线 rectilinear element 直演生线 rectilinear generatrix ...
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多年来无线电广播在传媒界中一直不受重视。
从Verizon收购Alltel而成为全美最大移动公司那时起,Verizon无线的债务就一直扩大,额度超过了200亿美元。
Verizon Wireless’s borrowings swelled when the carrier bought Alltel Corp. to become the largest U.S. mobile-phone company, taking on more than $20 billion in debt.
这种安排一直持续到1930年,当时的无线短波改善和降低了通讯费用。
This arrangement lasted until the 1930s, when the invention of short-wave wireless improved and cut communications costs.
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