这已经完成了，因为控制棒，不在卵石层那。

And this is done because the control rods are not in the pebble bed.

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另一种高温的气体反应堆是，我们称之为卵石层反应堆。

Another type of high temperature gas reactor is what we call a pebble bed reactor.

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这些砂卵石层一般具有埋深不大、变形小、承载力高、厚度大的特点。

These sand gravels stratum have the characters of shallow cover, small transform, high bearing capability and big thickness.

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