When establishing finite element calculation model of three-axle bogie frame, it must be certain that the weight of each of the three axles is equal while adding restraint.

分析了三轴转向架构架在有限元计算分析时，约束的施加必须保证三根轴的轴重一致性；分析比较了中间轴一系簧垂向刚度对构架强度产生的影响。

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What is the company's policy? You must be certain that you know what it is!

公司的政策是什么？你必须确信你知道政策是什么！

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This can present certain social concerns, and while it is important to let the child explore his new environment, it goes without saying that appropriate social behaviors must be taught.

这可以引起一定的社会关注，然而，最重要的是让孩子自己探索新的环境，不言而喻，必须教孩子这种适当的日常行为。

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Sinn Fein is opposed to flying the Union Flag, and the party is currently seeking a judicial review of a ruling by Northern Ireland Secretary of State Peter Mandelson that it must be flown on certain days.

BBC: Veterans gathered at the cenotaph in Belfast

As I mentioned antenna design engineers have gotten very good at what they do but since each antenna must be electrically matched to the transmitter and receivers, it has to have certain characteristics that differ from the antenna for a different portion of the spectrum.

FORBES: The iPhone 4 Antenna Unravelled