Follow the practice of explicitly stating when a specific sequence within such a group of steps is mandatory.
当在这样一组步骤的特定顺序被托管时，请习惯于跟随明确的状态。
This mapping is the common practice, but it is not mandatory, though.
这种映射是常见的使用方式，但不是必要的。
As is proved in practice, the traditional mandatory environmental administrative management can not well meet the practical demand of environmental protection nowadays.
实践证明传统的强制性环境行政管理手段不能完全适应当今环境保护的现实需要。
China has had efforts in the legislation and practice of non-mandatory disclosure, which has had certain complementary and catalytic work on mandatory disclosure.
我国对非强制性信息披露在立法和披露实践上都进行了一定努力，对强制性信息披露起到了一定的补充和促进作用。
To the benevolent reader-greetings. It would seem superfluous, if the practice of so many learned men had not made it almost mandatory, to write a preface explaining the purpose of this work.
尊敬的读者：写个前言说明著作的写作目的，看起来是必要的，众多学者的实践甚至使它变得不可或缺了。
To the benevolent reader-greetings. It would seem superfluous, if the practice of so many learned men had not made it almost mandatory, to write a preface explaining the purpose of this work.
尊敬的读者：写个前言说明著作的写作目的，看起来是必要的，众多学者的实践甚至使它变得不可或缺了。
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