A rationally arranged syllabus is like a nutritiously balanced recipe. Each item of the syllabus is beneficial and compulsory and can not be ignored. There is no room for other choices.
一个合理编列的课程表，犹如一个营养均衡的食谱，里面各个项目都是有益而必须的，不可偏废，不可再有选择。
The content of formaldehyde is a compulsory examination item in textile inspection, so it is very necessary to understand related factors that affect the determination of formaldehyde content.
甲醛含量作为纺织产品检验工作中的一项强制性考核项目，了解和掌握影响其测定的相关因素是十分必要的。
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