band

英语来自法语的词非常多，band就是个例子。法语里bande是个多义词：
1. 'group of people' => 乐队
2. 'flat strip, edge, side' (想象下夜里爬到楼顶往下看舞龙灯的group of people)

A concert band, variously also called a wind ensemble, symphonic band, wind symphony, wind orchestra, wind band, symphonic winds, symphony band, or symphonic wind ensemble, is a performing ensemble consisting of members of the woodwind, brass, and percussion families of instruments, and occasionally including the double bass or bass guitar. 音乐会乐队，也被称为管乐团、交响乐团、管乐交响乐团、管乐团、管乐团、交响乐团、交响乐团或交响乐管乐团，是由木管乐器、铜管乐器和打击乐器家族的成员组成的表演合奏，偶尔还包括低音提琴或低音吉他。A school band is a group of student musicians who rehearse and perform instrumental music together.

Bands are a form of formal neckwear, worn by some clergy and lawyers, and with some forms of academic dress. A belt is a flexible band or strap, typically made of leather or heavy cloth and worn around the waist or above the hips, that is usually of less circumference than the hips underneath. A wedding ring or wedding band is a finger ring that indicates that its wearer is married.

A frequency band is an interval in the frequency domain, delimited by a lower frequency and an upper frequency.

A radio band is a small contiguous section of the radio spectrum frequencies, in which channels are usually used or set aside for the same purpose. To prevent interference and allow for efficient use of the radio spectrum, similar services are allocated in bands. For example, broadcasting, mobile radio, or navigation devices, will be allocated in non-overlapping ranges of frequencies.

For each of these bands the ITU has a bandplan which dictates how it is to be used and shared, to avoid interference and to set protocol for the compatibility of transmitters and receivers.

As a matter of convention, the ITU divides the radio spectrum into 12 bands, each beginning at a wavelength which is a power of ten (10ⁿ) metres, with corresponding frequency of 3×10⁸⁻ⁿ hertz, and each covering a decade of [十倍]  frequency or wavelength. Each of these bands has a traditional name. For example, the term high frequency (HF) designates the wavelength range from 100 to 10 metres, corresponding to a frequency range of 3 MHz to 30 MHz. This is just a naming convention and is not related to allocation; the ITU further divides each band into subbands allocated to different uses. Above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that the atmosphere is effectively opaque, until it becomes transparent again in the near-infrared and optical window frequency ranges.

decade [Date: 1400-1500; Language: French; Origin: décade, from Greek dekas, from deka 'ten'] 又是个例子。

Ultra-wideband (also known as UWB, ultra wideband, ultra-wide band and ultraband) is a radio technology that can use a very low energy level for short-range, high-bandwidth communications over a large portion of the radio spectrum.

In telecommunications, in-band signaling is the sending of control information within the same band or channel used for data such as voice or video.

六级/考研单词: symphony, orchestra, brass, bass, rehearse, clergy, rigid, strap, waist, hip, underneath, fingerprint, interval, domain, spectrum, interfere, allocate, podcast, mobile, navigate, dictate, protocol, compatible, transmit, convention, correspond, designate, farther, radiate, opaque, transparent, portion, telecommunications, data