We derive the addition formulas for sine and cosine from the arithmetic of complex numbers.用复数算术推导了正弦,余弦的加法公式.The designing amendatory formulas will make the marine gearing of ship become more reasonable and safer.利用此公式计...
天气变暖了, 就要把植物移至5升的罐子里,并把罐子放在室外.When the weather is warm, put them into 5 liter 5 - liter pots and place them outside.虽然它的体积很小,但是它却能够每分钟泵出多达2.5升的血液.Despite its tiny size it can pump up to 2.5 litres of blood every minute.当...
他也谦和的说, “ 小朋友好呀, ”" How d'you do, friend ? " he answered amiably.他― ― 那位温良谦和的人 ― ―甚至也想用随便什么,只要是不礼貌的语言,来把自己的愤慨表达出来.He even - that mild and courteous man - was inclined to express himself in anything but courteous ter...