...competing parties clamouring for the attention of the voter. [VERB + for]

互相竞争的政党吵闹着争取选民的注意

At breakfast next morning my two grandsons were clamouring to go swimming. [VERB to-infinitive]

第二天早饭时，我那两个孙子嚷嚷着要去游泳。

Kathryn's quiet voice stilled the clamour.

凯瑟琳平静的声音使得嘈杂声平息了下来。

She could hear a clamour in the road outside.

她能听得见外面路上的吵闹声。