乙烯

例句：

1. 1. The plant produces ethylene gas, which is essential for the growth of fruits and vegetables.
   这种植物产生乙烯气体，对水果和蔬菜的生长至关重要。
2. 2. Ethylene gas is used in agriculture to promote fruit ripening and increase crop yields.
   在农业中，乙烯气体用于促进水果成熟和提高作物产量。
3. 3. In some cases, high levels of ethylene can cause flowers to bloom prematurely or even turn brown.
   在某些情况下，高浓度的乙烯可能会导致花朵提前开放或甚至变黄。