The term principal is used generically to refer to either a user or a group of users.

术语主体通常是指用户或用户组。

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First of all, reconstruction must be implemented in a well-coordinated framework that has long-term sustainability as its guiding principal.

首先，必须在一个协调良好的框架内开展重建工作，这个框架将长期可持续性作为其指导原则。

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The principal long-term victims of this struggle are the Kuchis. Their annual migrations face ever greater competition from the expansion of settled communities.

首当其冲的长期受害者是Kuchi人，他们一年一度的迁徙活动正遇到前所未有的挑战，因为定居的族群正在扩大。

youdao

The principal long-term baseload electric power fuel arbitrage is and has been coal-v-uranium.

FORBES: Post Fukushima-- burn more coal and oil, and hire more engineers not regulators

The principal long-term victims of this struggle are the Kuchis.

ECONOMIST: Modern politics meets ancient grievances

Mrs McGuire said that making a start on implementing the recommendations contained in the report - called Improving the Life Chances of Disabled People - was one of her principal medium-term goals.

BBC: NEWS | UK | Trials for disabled benefits plan