英语语法分析

They've developed these sensors that can detect tiny amounts of ethylene.

他们已经开发了这些传感器，可以检测到微量的乙烯。

Ethylene is the natural plant hormone in fruit that makes them turn ripe, apparently.

很明显，乙烯是水果中天然的植物激素，使水果成熟。

Auxin also causes the plant to develop a vascular system, to form lateral roots, and to produce ethylene.

生长素还能使植物形成维管系统，形成侧根，并产生乙烯。