1.Taking the output in 1976 as 100, the output of grain this year rose to 140.
2.By using the new process the reject rate was reduced to 3 per cent.
a)By 名詞 is meant 名詞:譯為:指的是...; 是指...;所謂...就是...
What is meant by energy? 能量的意思是什么?
By energy is meant the ability to do work. 能量指的是做工的本領.
By motor is meant a machine changing electrical energy into mechanical energy. 所謂電動機就是把電能轉變為機械能的機器.
By friction is meant a force opposing motion. 摩擦力指的是阻礙運動的一種力.
By acceleration is meant the rate of change of velocity with time. 加速度指的是速度隨時間的變化率.
By power is meant the rate of doing work. 所謂功率指的是做工的速率.
b) by 名詞 we (someone) mean (meant)名詞 譯為:...(我們)指的是...; ...是指...; 所謂...就是...
By DC we mean a current always flowing in one direction. 直流電是指始終都在一個方向上流動的電流.
By motion we mean the change in the position of a body. 所謂運動就是物體位置的變化.
By free electrons we mean some particles charged negatively and being free to move from atom to atom within a conductor. 自由電子指的是一些帶負電, 能在導體內部從一個原子移動到另一個原子的微粒.
By heat engine people mean an engine converting heat energy into mechanical work. 熱機是指把熱能轉變為機械功的一種發動機.
c)by名詞 it is meant that 句子譯為: ...指的是...;...是指...;所謂...就是...;...的意思是...
By AC it is meant that a current flows first in one direction and then back again. 交流電的意思是電流首先沿某方向流動,然后再往回流動.
By vector it is meant that a quantity possesses both magnitude and direction. 矢量指的是既有大小,又有方向的量.
By capacitor it is meant that a device keeps electricity in store. 電容器是保存電能的器件.
Often does he do like this.
This hall is five times bigger than our classroom. 這個大廳比我們的教室大五倍。（是我們教室的六倍大）
The car runs twice faster than that truck. 這輛轎車的速度比那輛卡車快兩倍。（是那輛卡車的三倍快）
The big box is four times as heavy as the small one. 大箱子是小箱子的四倍重。
Asia is four times as large as Europe. 亞洲的面積是歐洲的四倍。
Ten is twice as much as five. 十是五的兩倍。
The plane flew ten times as high as the kite. 那架飛機飛行高度是那個風箏的十倍。（高出九倍）
c).... times＋the＋名詞（size, height, weight, length, width）＋of
Your playground is 900 metres wide, three times the size of ours. 你們操場有900米寬, 是我們的三倍。
This street is four times the length of that one. 這條大街是那條街的四倍長。
This big tree is four times the height of that small one. 這棵大樹的高度是那棵小樹的四倍。（比那棵小樹高三倍）
也可譯成: The height of the big tree is four times that of that small one.
d).... times＋more＋名詞（可數, 不可數）＋than...
There are four times more books in our library than in yours. 我們圖書館藏書（數量）是你們圖書館的四倍。（多三倍）
We have produced twice more grain this year than we did last year. 我們今年生產的糧食比去年增長一倍。（是去年的兩倍）
e).... times ＋as many（或much）＋名詞＋其它……
There is three times as much water in this pot as in that one. 這個壺里的水（量）是那個壺里的三倍。
There are five times as many students as we expected. 到的人是我們預計的五倍。
如: The grain output in that village was twice over that of 1978. 那個村的糧食產量比一九七八年的增加了兩倍。
g).... times＋that of＋被比對象“是……倍”。
如: In this workshop, the output of July was 3. 5 times that of January. 這個車間七月份的產量是元月份的三點五倍。
My room is three times as big as yours.我的房間是你的房間的三倍大。
My room is three times biggger than yours.我的房間比你的房間大三倍。也就是說 我的房間是你的房間的四倍大。
這兩個詞意義相近，但略有不同。 separate 指把結合或聚集在一起的東西分離出來，或將相關的或相臨的事物隔離開來； divide指把一個整體分成若干部分。
例如： The land is separated into small fields. 那塊地被分割成小塊的田地。
Separate the good ones from the bad. 把好的和壞的分開。
The whole class was divided into three groups. 全班分成三個小組。