问题: 请翻译中美关系相关句子成英文！
利益集团的大量存在与频繁活动也极大地影响了美国的对华政策。近年来，中美关系时冷时热，波折不断的背后，都不难看到利益集团活动的影子。
解答:
America's policies to China is very much affected by the large number of interested parties in existence and their frequent activities. It is not too difficult to detect shadows of interested parties activities behind the ups-and-downs and mistrust-and misunderstandings in recent years' Sino-American relationship.
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