1. The chemisorption of the gas molecules onto the surface of the catalyst is a key step in the reaction.
化学吸附是气体分子在催化剂表面上的一个关键步骤。

2. Chemisorption is often used in catalysis to enhance the reaction rate and selectivity.
化学吸附常常在催化中用来提高反应速率和选择性。