Energy is particularly concentrated at the steep chemical gradients of hydrothermal vents.

能量特别集中在热液喷口的陡峭化学梯度上。

They're attracted to a chemical at the other end and by sensing the chemical gradient they can pick the shortest path.

它们被另一端的化学物质吸引，通过感知化学梯度，它们可以选择最短路径。

The first life form wouldn't have had other organisms to consume, of course, so it must have been an autotroph, generating energy either from the sun or from chemical gradients.

当然，最初的生命本来就不会有其他生物来消耗其能量，所以它一定是从太阳或化学梯度产生能量的自养体。