开普勒首先发现了每个行星都以椭圆曲线绕太阳运行,太阳则位于椭圆的焦点。(with the sun at,..为介词复合结构作状语,补充说明。)
33.It should be noted that a rocket does not depend on the atmosphere for its propulsion,but would actually perform better in the absence of an atmosphere becauseOf lessened air resistance.
应该注意,火箭的推力与大气无关,在没有大气的情况下,由于空气阻力减小,火箭实际上会运行得更好。(in the absence of anatmosphere含有虚拟条件的意味。)
34.Electrical power is always carried over long distances as a high-tension current at low-currentstrength.It is also sent as an alternating current,for such current is comparatively easily transformed eitherup ordown in voltage.
电力总是以高电压低电流的方式进行远距离输送的,又是以交流电的形式送电的,因为这种交流电易于升压或降压。(两个as构成的介词短语都用作方式方法状语,分别说明iscarried和issent。)
35.When one considers the immense change in the size and reliability of computers and all other electronic devices that has taken place,it is clean that computers for doing this type of control of movement according to sense impression will certainly be available.