Selecting the primary option installs a primary node and creates a cluster.

选择主选项会安装一个主节点并创建一个集群。

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At present, a tunnel scheme has become a primary option of a long-distance oil-gas pipeline through mountains.

目前，隧道方案已经成为长距离油气管道通过山区的一个主选方案。

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Congress faced strong pressure to boost the debt-ridden flood insurance program, which is the primary option for that type of coverage for U.S. homeowners and businesses.

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However, given the work that we have done at the plant in Delaware and the fact that we own it, it is still our primary option to consider.

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In the United States, 40 of these advanced imaging machines are in use in 19 airports, according to the TSA. Only in six airports are they used as a primary screening option.

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