导致美国两党制的一个原因是，每个国会议员选区只能选出一名代表。
One factor contributing to the two-party system in the United States is the single-member district system of electing Representatives.
波尔考先生是一个保守的人，他在1997年时第一次入选了国会议员选区的选民。
Mr Bercow, a Conservative, was first elected for the constituency in 1997.
国会议员利用周末在各自的选区征求意见。
Members of Congress are spending the weekend canvassing opinion in their constituencies.
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