求翻译：预选是美国总统选举的第一阶段，通常从大选年的年初开始，到年中结束。预选有两种形式，分别是政党基层会议和直接预选。是什么意思？

Preselection is the first phase of the US presidential election , usually starting from the beginning of an election year , to the end of the year .

Pre-selection is that the President of the United States elections in the first phase, it is often the election year in the beginning of the year, in the middle of the year. Pre-selection there are two forms, namely, political parties at grass-roots level and direct pre-selection.

The preelection is the US presidential election first stage, usually from the presidential year beginning of the year start, finished to the year in.The preelection has two forms, respectively is the political party basic unit conference and the direct preelection.

Preselection is United States presidential election in the first phase, usually from the beginning of an election year, to end in the year. There are two primary forms, namely caucuses and direct primaries.

正在翻译，请等待...