通过观察实验来学习物理是一条十分有效的学习途径，可以起到事半功倍的效果。因此，我们有必要对中学物理演示实验的教学进行研究。
It is a good method to learn physics via watching experiments, get twice the result with half the effort so it is necessary for us to research Physical demonstration experiment.
通过我们在研究G5的过程中所创造的奇迹，我们能够消除不必要的材料浪费并且用更轻，更灵敏的碳布取代传统的玻璃纤维。
Through the miracle of our G5 process, we were able to remove every gram of unnecessary material from each blank and replace traditional glass hoop fibers with lighter, more responsive graphite.
正因为基因的这一特性，我们才有必要通过立法来对人们的基因研究及利用活动加以正确的引导和合理的制约，避免基因研究和利用给人们带来的消极影响和后果。
Just because of this, we have to legislate to guide and restrict the researches and USES of gene in a correct way, so as to avoid the negative impact and consequences for human.
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