vt. 1.获得；博得，挣得；赢得，打胜(战争、官司)。 2.吸引；争取…(到一边)，说服。 3.(尤指通过努力)到达(目的地)。 4.增加，增进；(钟、表等)走快 (opp. lose)。 短语和例子 gain one's living 谋生。 gain the summit 到达山顶。 My watch gains five minutes a day. 我的表每天快五分钟。 vi. 1.得利，得益。 2.前进，进步。 3.增加，增重，增进。 4.(钟、表等)快走。 短语和例子 gain by comparison [contrast] 比较[对比]之下显出其长处。 gain ground 进展，占优势。 gain headway 前进。 gain in 获得，增长(gain in health 增进健康。 gain in influence 影响增长)。 gain on [upon] 1. 蚕食，侵入。 (The sea gains on the land. 海水侵入陆地)。 2. 接近，逼近，赶上。 3. 占优势，超过，胜过。 (The days are gaining on the night. 白天渐渐比夜晚长了)。 4. 得欢心，巴结上。 gain one's ends 达到目的。 gain one's point 贯彻自己意见。 gain over 说服，拉拢过来。 gain speed 渐渐增加速度。 gain strength 力量增加；(风力等)渐强。 gain the ear of 得人倾听。 gain the wind 占他船的上风。 gain time 1. (钟、表等)走得快。 2. (用拖延等办法)争取时间。 n. (opp. loss) 1.获利，获得。 2.得益，利益。 3.〔 pl.〕 收益，利润；报酬，奖金。 4.增大，增加，增进。 5.【无线电】增益，放大，增量。 短语和例子 be blinded by the love of gain 利令智昏。 Ill-gotten gains never prosper. 〔谚语〕不义之财，发不了家。 No gains without pains. 〔谚语〕不劳则无获。 a gain to one's happiness 幸福的增进。 n. 【建筑】 1.(木料上或墙上的)腰槽。 2.雄榫上的斜肩。 vt. 在…上开腰槽，用腰槽连接。
the amount of increase in signal power or voltage or current expressed as the ratio of output to input 同义词：amplification,
the advantageous quality of being beneficial 同义词：profit,
the amount by which the revenue of a business exceeds its cost of operating
a quantity that is added; "there was an addition to property taxes this year"; "they recorded the cattle''s gain in weight over a period of weeks" 同义词：addition, increase,
increase (one''s body weight); "She gained 20 pounds when she stopped exercising" 同义词：put on,
increase or develop; "the peace movement gained momentum"; "the car gathers speed" 同义词：gather,
rise in rate or price; "The stock market gained 24 points today" 同义词：advance,
obtain advantages, such as points, etc.; "The home team was gaining ground"; "After defeating the Knicks, the Blazers pulled ahead of the Lakers in the battle for the number-one playoff berth in the Western Conference" 同义词：advance, win, pull ahead, make headway, get ahead, gain ground,
reach a destination, either real or abstract; "We hit Detroit by noon"; "The water reached the doorstep"; "We barely made it to the finish line"; "I have to hit the MAC machine before the weekend starts" 同义词：reach, make, attain, hit, arrive at,
win something through one''s efforts; "I acquired a passing knowledge of Chinese"; "Gain an understanding of international finance" 同义词：acquire, win,
earn on some commercial or business transaction; earn as salary or wages; "How much do you make a month in your new job?"; "She earns a lot in her new job"; "this merger brought in lots of money"; "He clears $5,000 each month" 同义词：take in, clear, make, earn, realize, realise, pull in, bring in,
derive a benefit from; "She profited from his vast experience" 同义词：profit, benefit,
obtain; "derive pleasure from one''s garden" 同义词：derive,
In electronics, gain is a measure of the ability of a circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output, by adding energy to the signal converted from some power supply. It is usually defined as the mean ratio of the signal output of a system to the signal input of the same system.
例句与用法
1.
By working hard he gained rapid promotion . 他工作努力因而晋级很快。
2.
The police car was gaining ground on the robbers . 警车逐渐追上劫匪。
3.
Mechanical energy can be lost or gained . 机械能可以消失或者可以增生。
4.
They at last gain me over in the debate . 他们终于在辩论中把我说服了。
5.
The old man was gaining line steadily now . 老头儿现在不住地收进钓丝。
6.
He could gain no sound of the sailor's name . 他说不出水手的名姓。
7.
By and by, however, he began to gain courage . 不过，后来他逐渐胆大了。
8.
He gained 500 dollars by this deal . 靠这笔交易他赚了五百美元。
9.
I gained ten pounds during summer vacation . 暑假中我的体重增加了十镑。
10.
They hesitated at nothing to gain their ends . 他们不惜一切来达到目的。
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