Most of the pits seem to be in the moon's ancient lava plains, scientists say.

科学家表示，大多数月坑似乎都在月球古老的熔岩平原上。

They had landed their lunar module on hardened lava plain known as the Sea of Tranquility.

他们的登月舱登陆在坚硬的火山岩平原，那里叫做宁静海。

The Chang'e 5 probe took geological samples from the moon's oceans of storms, a vast lava plain.

嫦娥五号探测器从月球风暴洋(一片广阔的熔岩平原)采集了地质样本。