Use parallel track development to work ahead, and follow behind.

采用并行轨道开发，提前工作，后期跟踪。

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The Justice Department probe began weeks ago and is essentially on a parallel track with the SEC investigation, the sources said.

该消息来源指司法部于数周前展开调查，几乎与证交会同步。

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The concept is simple: using identical equipment, drivers compete head-to-head in heats on a parallel track, to prove they're the greatest.

这个概念很简单：使用相同的装备，车手直接竞争，在一个并行的赛道上激烈竞争，以证明他们是最棒的。

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The government will aim to maintain their parallel track whatever happens in the courts.

BBC: Is HS2 steaming ahead or in danger of going off track?

The Senate Finance Committee is on a parallel track, reviewing discussion papers and collecting feedback from members and stakeholders.

WSJ: Max Baucus and Dave Camp: Tax Reform Is Very Much Alive and Doable

If they make some maneuvers they could be on a parallel track.

WHITEHOUSE: Press Briefing