spectrum n. (pl. -tra ) 1.【物理学】谱,光谱;波谱;能谱,质谱。 2.【无线电】射频频谱;无线电(信号)频谱。 3.【心理学】(眼睛的)余像;残像。 4.〔转义〕范围,幅度;(连续的)系列。 an absorption spectrum 吸收(光)谱。 a bright line spectrum 线状光谱。 an optical spectrum 光谱。 a solar spectrum 太阳光谱。 a wide spectrum of opinion 意见的不同幅度甚大。
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家科学研究机构提出证明:大蒜在许多其它领域具有治疗和促进健康的作用。
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技术具有上下行链路不对称、频谱利用率高、发射功率低等优点,非常适合于第三代移动通信中的非对称数据业务,并可以提供较高的系统容量,特别是能够满足我国一些地区人口密集而频谱资源紧张的需要。