in opposition to
These two sets of muscles are said to act in opposition to each other.
这两套肌肉据说是互相反向动作的。
We found our selves in opposition to our friends on this question.
我们发现我们对于这个问题和我们的朋友意见相反。
=与...相反

不错

顶楼主

in person
If you don't have questions, we will go in now and see some of these creatures in person.
要是你们没有什么问题来，那我们现在就进去亲眼看看这些动物。
=亲自

回复：45楼
这人真奇怪，只选些赞同的支持的声音回复。上面那群人为了BEACH PERSON那词讨论老半天，不见做声，只自顾自的上传，下面一有赞同的声音，就立马回复。
。。。

不是啊，有人都正确地回答了啊。
关键是这个论坛没有修改功能，否则都配上译文了。

in place of
In place of the usual Wednesday class, I've arranged an optional review session.
我安排了一个自由参加的复习，来代替平时周三的课。
=instead of 替代

汗。

in proportion to
In proportion to its size, the earth is the heaviest of all the planets.
按它的大小比例来说，地球是所有行星中最重的一个。
The high-pressure engine was far lighter in proportion to horsepower.
高压引擎就其与马力的比例而言要轻很多。
=就。。。的比例而言

in question
The job in question is available for three months only.
所谈到的这一工作空缺有效时间为三个月。
To simulate natural sounds in music, composers often use the orchestral instrument that they feel most nearly approximates the sound in question.
为了模仿音乐中的自然声音，作曲家们常常运用他们觉得最接近这个声音的乐器。
=adv.正被讨论的


in relation to
You can see their size in relation to the hands holding them.
你可以根据拿着它们的手的比例判断它们的大小。
The bee scout tells the other workers what direction to fly in relation to the Sun.
侦察蜂告诉其他工蜂以太阳为参照往哪个方向飞。
=相对…而言