The second order is more momentous.

第二项指令则更加声势浩大。

Second order. There are two species here.

第二级，有两种物质。

It has second order accuracy in time.

该算法在时间上具有二阶精度。

The reaction of HMG with glycine is a second order reaction.

HMG 与甘氨酸的反应是二级反应。

The transesterification obeys a second order reaction kinetics.

该酯交换反应遵循二级反应动力学。