一周以后，弗莱契对一班新学员讲授高速飞行的原理时在作示范动作。
It happened just a week later. Fletcher was demonstrating the elements of high-speed flying to a class of new students.
根据昆虫扑翼飞行的原理，设计了一种基于昆虫胸腔式结构的静电驱动微扑翼机构。
This paper studied a micro flapping mechanism that was based upon insect thorax and actuated by electrostatic force according to the flapping flying theory of insects.
要知道，虽然蝙蝠和鸟类利用翅膀飞行的原理都一样，然而它们的翅膀却是沿着不同道路进化而来的。不同动物的识数能力也可能是在各种不尽相同的情况下分别进化出来的。
Just as bat and bird wings evolved separately yet work using the same fundamental principles, numerical representation may have developed in many separate instances.
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