提前计划好要创造的画面以确保所有的电子元件共同完成任务。

Plan to create the visuals in advance, to ensure all of the electronic components work together and be sure to rehearse with them.

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哈勃望远镜的工作寿命一而再地得到了延长，航天飞机宇航员也完成了5次维修任务。他们不仅修复了出故障的元件，而且为仪器升了级，给仪表更换了电池。

Hubble's life has been extended time and again through five servicing missions in which space shuttle astronauts have fixed faulty components, upgraded instrumentation and replaced batteries.

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相乘器是由非线性元件组成，可以实现两个信号的相乘，完成频率变换的电路。

Multiplier is the circuit which is conformed of nonlinear elements and can make two signal multiplied so that it can implement frequency transformation.

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