He strained every muscle to lift the heavy rock.

他竭尽全力举起那个很重的石头。

Then she lifted a heavy rock on top of the board.

然后她在木板上举起一块沉重的石头。

About 150 tools were excavated in Kenya. They include sharp flakes of stone used for cutting, hammers and heavy rocks that most likely served as anvils.

他们在肯尼亚发掘出了大约150把工具，包括用于切割的锋利石斧、锤子和可能用作铁砧的大石头。

Scientists found that Goliath frogs, which are Earth's largest living frogs and can be longer than an American football, construct protected ponds for their young by pushing heavy rocks across streams.

科学家发现非洲巨蛙——体型可大于美式足球的、世界上现存的最大的蛙——会推动大石头来拦住溪流，以此为后代建造受保护的池塘。

CAMEROON AND EQUATORIAL GUINEA: Scientists found that Goliath frogs, which are Earth's largest living frogs and can be longer than a football, construct protected ponds for their young by pushing heavy rocks across streams. They live only in this region.

喀麦隆和赤道几内亚：科学家们发现，歌利亚蛙是地球上现存最大的青蛙， 身长可能比足球还长，它们通过将沉重的石头推过溪流来为幼崽建造受保护的池塘。 他们只生活在这个地区。