Modern phase array systems require a large number of expensive phaseshifters.

现代相控阵当中需要大量昂贵的移相器。

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On the desk, among the neat array of papers, a large envelope was uppermost.

纸张整齐地堆放在桌上。最上面有一个信封。

youdao

On the desk, among the neat array of papers, a large envelope was uppermost.

纸张整齐地堆放在桌上。最上面有一个信封。

youdao