1.3Grammar & Diction1.3.1正确的语法1.3.1.1人称We carried out several studies which .( It was carried in several studies that . )First, you adjust the dial at the top of machine to the temperature you wish, then you turn the switch “on-off” to start the machine.It is known to all that there is no air in space.All of these values were obtained by gas chromatography/ mass spectrometry.All further investigations showed .( It was showed that all further investigat
