I strongly oppose that contention.是什么意思？

I strongly oppose that contention.

我强烈地反对那种主张。

strongly

adv. 强烈地，坚强地，坚固地，强有力地；

例句
I strongly disagree with this amoral approach to politics...
我强烈反对这种对待政治不辨是非的态度。

oppose

vt.& vi. 反对，抗争，使相对，使对照，抵制；

例句
Members are concerned that a merger might mean higher costs, in which case they would oppose it.
成员们担心合并会导致成本提高，若是那样的话，他们将提出反对。

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

contention

n. 竞争，争论，争夺，论点；

例句
This evidence supports their contention that the outbreak of violence was prearranged.
这一证据证实了他们的观点，即此次突发暴力事件是有预谋的。