新概念二第55课中的一句话.A new machine called‘The Revealer’has been invented and it has been used to detect gold which has been buried in the ground.在里面为什么用现在完成时?另外黄金是早就埋在地下了的,应该是

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新概念二第55课中的一句话.A new machine called‘The Revealer’has been invented and it has been used to detect gold which has been buried in the ground.在里面为什么用现在完成时?另外黄金是早就埋在地下了的,应该是

新概念二第55课中的一句话.A new machine called‘The Revealer’has been invented and it has been used to detect gold which has been buried in the ground.在里面为什么用现在完成时?另外黄金是早就埋在地下了的,应该是
新概念二第55课中的一句话.
A new machine called‘The Revealer’has been invented and it has been used to detect gold which has been buried in the ground.
在里面为什么用现在完成时?另外黄金是早就埋在地下了的,应该是用过去完成式啊?

新概念二第55课中的一句话.A new machine called‘The Revealer’has been invented and it has been used to detect gold which has been buried in the ground.在里面为什么用现在完成时?另外黄金是早就埋在地下了的,应该是
你的疑问很好!
其实如果说前面发明机器的地方用过去式也是可以的,但不如用完成时好,为什么呢,先看看对现在完成时的解释:现在完成时(Present perfect)指过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态.这样你就能理解作者用法的巧妙了吧,首先是“探宝器”的发明对现在(其实是一个很长的时期)造成的影响就是可以”挖金“了,而且还可以从中理解另一点就是这种仪器可能不是一发明出来就好了不变了的,还应该是在最初发明出来的原型上不断地改进着(也就是说,发明不是一瞬间的动作,而是一个长期的行为),不是吗?
至于后面一点用完成时,是因为黄金是”蕴藏“在地下的,明白不,不是埋下去就完了这样一个简单的动作,而是描述为一种状态,是一直埋在地下的黄金(再回头看看对”现在完成时“定义的后半句话).
这样解释懂了不?

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