The goals of the vicissitudes of tax system of China gradually change, but its immovability is coercion and expediency.

在中国的税制变迁中，不断变化的目标背后相同的变迁理念是强制和权宜。

Because of their immovability and light-dependent lifestyle, organ size of plants is frequently influenced by external environmental signals.

由于植物不能活动，并且具有依赖于光的生活方式，植物器官大小经常受到外界环境信号的影响。