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lumbersome adj.麻煩的;笨重的。

lumberyard

In the non - coaxial bwo of l - band , the radius of the slow - wave structure is very large , and the volume and weight of the guiding - magnetic system are also very large . thus , the non - coaxial bwo of l - band is bulky and lumbersome and is inconvenient for real application 若采用非同軸相對論返波振蕩器實現l波段的微波輸出,則要求慢波結構的平均半徑很大,導引磁場系統的體積和重量會變得較大,這給器件的小型化帶來了很大的困難。