spectrum n. (pl. -tra ) 1.【物理學(xué)】譜,光譜;波譜;能譜,質(zhì)譜。 2.【無線電】射頻頻譜;無線電(信號)頻譜。 3.【心理學(xué)】(眼睛的)余像;殘像。 4.〔轉(zhuǎn)義〕范圍,幅度;(連續(xù)的)系列。 an absorption spectrum 吸收(光)譜。 a bright line spectrum 線狀光譜。 an optical spectrum 光譜。 a solar spectrum 太陽光譜。 a wide spectrum of opinion 意見的不同幅度甚大。
When garlic is crushed , the allium is converted to an antibiotic called allicin . allicin appears to have broad - spectrum effectiveness in fighting infections 直到1987年,已有1275家科學(xué)研究機(jī)構(gòu)提出證明:大蒜在許多其它領(lǐng)域具有治療和促進(jìn)健康的作用。
Tdd - cdma has so much technology advantage such as high spectrum effectiveness , big capacity , supporting asymmetrical uplink and downlink and so on , that it can especially solve the problem of some areas in our country which have overpopulation and scarcity of spectrum resource Tddcdma技術(shù)具有上下行鏈路不對稱、頻譜利用率高、發(fā)射功率低等優(yōu)點(diǎn),非常適合于第三代移動通信中的非對稱數(shù)據(jù)業(yè)務(wù),并可以提供較高的系統(tǒng)容量,特別是能夠滿足我國一些地區(qū)人口密集而頻譜資源緊張的需要。