To read the punched cards into the computer requires a card reader instead of the tape reader . 要把穿孔卡写入计算机，就需用卡片输入机来取代纸带输入机。
The measurement of the fatty acid composition of fats involves the use of techniques of gas-liquid chromatography . 测定脂肪内的脂肪酸成份需用气液色谱分析技术。
If a range of specimen sizes is needed for materials tests, the fixtures should be carefully scaled to the specimen . 如果材料试验需用一系列的试样尺寸，则夹具就应当仔细地按试样进行标度。
Placing such systems on roof-tops reduces the need for land and puts them close to the places where the energy will be used . 将这种系统安装在屋顶上，既减小土地的需用量，还能使它们靠近需要用电的地方。
A pilot battery should be used for observation of forming progress, until such time that uniform experience indicates that such attention is not needed . 需用一个领示的电池来观察形成过程，直到实验结果均一，无须加以注意时为止。
In english , some questions have a rising intonation 英语中有些疑问句需用升调
In english , some questions have a rising intonation 英语中有些疑问句需用升调
Denotes facilities unavailable or not applicable 表示没有该种设施或不需用该种设施
1 . money is not everything , there ' s mastercard & visa 钞票不是万能的,有时还需用信用卡
A screwdriver and a hammer are the only tools you need 你需用的工具只是改锥和锤子
