大全199关于by的用法。

amy7777

大全199

Car owners who inflate their tires properly can substantially boost their vehicles’ fuel efficiency, since the increase in car-road friction can waste up to five percent of car fuel by underinflation.

(A) Car owners who inflate their tires properly can substantially boost their vehicles’ fuel efficiency, since the increase in car-road friction can waste up to five percent of car fuel by under inflation.

(B) Because the underinflation of tires can waste up to five percent of a car’s fuel by increasing car-road friction, car owners can substantially boost their vehicles’ fuel efficiency by properly inflating the tires.

(C) Their vehicles’ fuel efficiency is substantially boosted by car owners through the proper inflation of tires that, when underinflated, can waste up to five percent of car fuel by an increase in car-road friction.

(D) The proper inflation of tires by car owners, due to the fact that underinflation can waste up to five percent of a car’s fuel by the increase of car-road friction, can substantially boost their fuel efficiency.（B）

(E) Because up to five percent of a car’s fuel are wasted through the increases in car-road friction when the tires are underinflated, car owners properly inflating tires can substantially boost their fuel efficiency.

白勇书上写道：

关于介词的使用：在被动语态中，by+名词，表示动作的执行者；主动语态中，by +doing表示动作的方式。

不明白的是B？？？

B) Because the underinflation of tires can waste up to five percent of a car’s fuel by increasing car-road friction, car owners can substantially boost their vehicles’ fuel efficiency by properly inflating the tires.

这里有两个by，第一个by increasing car-road friction, 这一句是主动语态，想知道在主动语态中by+名词表示什么意思呢？？

amy7777

ding

amy7777

顶

nicolechan28

ＢＹ　ＤＯＩＮＧ　通过。。。的方式

amy7777

以下是引用nicolechan28在2006-9-20 22:52:00的发言：
ＢＹ　ＤＯＩＮＧ　通过。。。的方式

我怎么觉得应该是被动呢，被增加的摩擦力浪费了？？？？？

amy7777

以下是引用nicolechan28在2006-9-20 22:52:00的发言：
ＢＹ　ＤＯＩＮＧ　通过。。。的方式

我怎么觉得应该是被动呢，被增加的摩擦力浪费了？？？？？

再看还是不明白,帮我解答一下呢.盼着.

米可可

underinflation可以通过增大车辆和路面摩擦从而造成高至5%的浪费。增大摩擦是underinflation造成浪费的手段方式。

wawa1983

increasing car-road fraction在 by也是表方式,通过增加车和路摩擦这种方式

不是表示动作的执行者

amy7777

by increasing car-road friction  明白了，通过增加车和路摩擦这种方式。本来做题的时候对这个car-road friction  糊涂，现在全明白了

谢谢米可可。