Sometimes convenience or practical necessity or just the fancy of an influential person can establish a fashion.
有时，某种便利或实际的需要，或仅仅是一个有影响力的人物的幻想就可以引领一种时尚。
The meaning of "required" here is that of practical necessity.
这里“需要”的意义，就是实际上的需要。
The recount is a practical necessity but has no basis in electoral law.
重新计票有实际的必要性，却无选举法作为法律基础。
In large businesses separation of ownershipand management is a practical necessity.
大型商业组织在实际的生产运作过程中，将公司的所有权和经营权分离开是很有必要的。
Once considered a luxury, the microwave oven had developed into a practical necessity for a fast-paced world.
曾被视为是奢侈品的微波炉，在这个快节奏的世界中已经成为一种现实生活的必需品。
It's of practical necessity and significance to legislate on rural medical security.
制定我国农村医疗保障法既有现实必要性，又有重要意义。
If you have thin, lank locks - or indeed a thick and unruly mop - then keeping it short may be a practical necessity.
如果你的头发又薄又稀或者又厚又翘，那么或许出于实际考虑，还是短发好。
Therefore, the design of reliable, safe, convenient resistance, capacitance, inductance tester of great practical necessity.
因此，设计可靠，安全，便捷的电阻，电容，电感测试仪具有极大的现实必要性。
Backward compatibility is required in cases where a contract or practical necessity defines the need to support previous versions.
如果合约或实际情况要求支持以前的版本，就必须保持向后兼容性。
A car may be a practical necessity for a student who works long hours after classes or who lives with his or her family in another town.
如果一个学生放学后还要工作到很晚或是和家人住在另一个城镇，车也许对他来讲是必需品。
Reaching this target is not only a practical necessity to ensure economic growth and employment, but also an important condition for restructuring the economy and raising its level of performance.
实现这一目标，既是保增长、保就业的现实需要，也是调结构、增效益的重要条件。
Reaching this target is not only a practical necessity to ensure economic growth and employment, but also an important condition for restructuring the economy and raising its level of performance.
实现这一目标，既是保增长、保就业的现实需要，也是调结构、增效益的重要条件。
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