1. He showed them whatrepresenteda river and how to find out the elevation.
他告诉他们什么代表河流以及如何算出海拔。
represent 表现,表示,提出,例如:
The roserepresentsEngland.
玫瑰花是英格兰的象徵。
The red lines on the maprepresentrailways.
这张地图上的红线代表铁路。
2.Yes, sir, youdefinitelywould — if you looked very quickly
是的,先生,你肯定能看到——如果你赶快看的话。
definitely 明确地,确切地,例如:
Try as he may (=Though he may try), he willdefinitelyfail.
虽然他会尝试去做,但无疑他必失败。
Yes,definitely.
是的,肯定的。
3. There's nothing between the tree and the river which is so high that itpreventsme from seeing you, so why would I have to look quickly?"
树和河之间没有任何高到足以阻碍我看到你的东西,我为什么必须赶快看?
prevent 预防,阻止,例如:
The government tried topreventthe diminution of resources.
政府试图阻止资源的减少。
The car came to a halt just in time topreventan accident.
汽车及时停下,避免了一场车祸。