They tried to think of a plan by which they could fulfill their task ahead of time.

问题描述:

They tried to think of a plan by which they could fulfill their task ahead of time.
1,It is a captivating base from which to explore Arizina's Grand Canyom.(亚利桑那州大峡谷) 这里的from which怎么理解啊
2,He seemed to be looking for words at his desk with which to convey his meaning as precisely as I had done.怎样理解with which,是convey his meaning with words吗?

恩,定语从句问题.和你所给出的例句一样.
by which 中的which 指的就是a plan (先行词) by which (关系代词)
同理:from which 等于where 也就是from the captivating base 即从那里出发去探寻亚利桑那大峡谷
那么,第二题 with which 就是with the words 只是at his desk 状语修饰了the words 可以省略不看,那么先行词就是words .convey his maning 是目的,with words toconvey..恩,和你说的一样..整个句子的意思是,他似乎想从桌子上找些文字来精确表达他的意思,就像我所做的事情一样精确.额,这个句子我翻译的不怎么地..凑合看吧
恩,问题明白没?