Now the pebble bed reactor has the same basic safety features as a high temperature prismatic reactor in a sense that it has a meltdown free core.

现在，卵石层反应堆有相同的基本，安全特征和高温棱柱反应堆一样，因为它有一个熔化的核心。

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Because of the inner core of the earth, there will have two nutation modes related to the earth's rotation, i. e. a prograde free core nutation (PFCN) mode and a inner core wobble (ICW) mode.

由于内核的存在，将出现两个新的与地球自转有关的章动模式，即顺向的自由核章动(PFCN)和内核摆动(ICW)模式。

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At the core of the "Free" models are the products or services being offered to the customer.

“免费”模式的核心内容是为顾客提供的产品或是服务。

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"It's about getting people engaged with the core free version and if they love it, they'll move upstream" to the paid versions, he said.

WSJ: When Freemium Fails

The above is mentioned because what Achatz experienced is free trade at its core.

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Only decisions necessary to the core function of free markets and free trade should have to be made in Europe.

BBC: News | UK Politics | John Maples speech in full