The basic features include a crest (the highest point of the wave), a trough (the lowest point), a height (the vertical distance from the trough to the crest), a wave length (the horizontal distance between two wave crests), and a period (which is the time it takes a wave crest to travel one wave length).
上面是新概念4 lesson40中一句话。解析上说加粗部分中的to travel one wave length是宾补。我认为是错的。to travel one wave length应该是真正主语,it是形式主语。it takes…是个定语从句修饰time,这里take作双宾动词,表示花谁多少时间。不知对否,还请专家老师帮忙解答。
老师,您好!
学生理解书中原句(which is the time it takes a wave crest to travel one wave length)可能存在有印刷错误:在a wave crest 前面漏写了一个介词for。
借助查阅到以下外刊资料的句子和定义:
根据以上定义可知,波动周期的概念指完成一次振动所需要的时间,即一个波峰到另一个波峰所需要的时间(实现一个波长跨度的时间量)。
学生感觉正确的写法可能应该是...., and a period (which is the time it takes for a wave crest to travel one wave length.).