1.
The unary minus (-) and unary plus (+) are the same operators as binary minus and plus.
一元减号（-）和一元加号（+）与二元加号和减号都是相同的运算符。
2.
There is a minus before the number to be subtracted.
在要减去的数字前有一个减号。
3.
It can include variables, constants, and operating symbols, such as plus and minus signs.
它能包含变量、常量、运算符，例如加号和减号。
4.
The unary minus produces the negative of the value.
一元减号得到的运算对象的负值。
5.
An algebraic expression consisting of three terms connected by plus or minus signs.
三项式一种包含有由加号或减号相连接的三项的代数表达式
6.
attenuator: a device that attenuates an electrical signal.
衰减器,减压器: 使电子讯号减弱的装置。
7.
A device that attenuates an electrical signal.
衰减器，减压器使电子讯号减弱的装置
8.
video attenuator switch
视频信号衰减器开关
9.
The sign '-'means minus.
‘—’这个符号是‘减’的意思。
10.
`Lower taxes' was their cry .
他们的口号是‘减税’.
11.
a sign indicating the operation of subtraction.
表示减少运算的符号。
12.
To reduce(the amplitude of an electrical signal)with little or no distortion.
减弱讯号在失真极小或不失真的情况下减弱（调幅或电子讯号）
13.
Cannot add or subtract relocatable symbols
不能增加或减少可重置的符号
14.
He re-entered the atmosphere and slowed the Mercury spacecraft.
他返回大气层，并使“火星”号航天器减速。
15.
Spirit opened its parachutes and fired rockets to slow down.
勇气号”打开降落伞点燃火箭减速。
16.
a copy that reproduces something in greatly reduced size.
一事物型号大大缩减后的复制品。
17.
The positive-going signal subtracts from the forward bias of the lower transistor.
正向信号则使它的正向偏压减弱。
18.
The government called on school to reduce the learning load.
政府号召学校减轻学生学习负担。