quad in-line

From car trunks and duffel bags and hard plastic carrying cases, out come the drones& from small quad-rotors to massive eight-armed octo-copters in varying shapes and sizes.

人们纷纷从汽车后备箱、背包和硬塑料行李箱中取出无人机&从小型四旋翼到大型八臂八旋翼直升机，形状和尺寸各异。

The research in this thesis is supported by the National Natural Science Foundation Project. The structure and dimension parameters of Quad Flat no-lead package ( QFN) devices has been optimized and analyzed.

本文依托于国家自然科学基金项目微电子封装中的界面层裂失效和界面强度可靠性设计方法，对四方扁平无引脚封装（QFN）器件进行了结构尺寸参数优化和分析。

I once lived in a quad.

我曾在四合院中住过.

Casually dressed and reluctant to network, Mr Wilkinson is unconcerned by his reputation in the City, preferring to spend time walking and riding his quad bike at his home in the Yorkshire moors.

威尔金森穿着休闲，不愿参加社交活动。他对自己在金融城的名声并不担忧，更愿意花时间在他约克郡老家的荒野中散步和骑四轮摩托。

The research in this paper on hardware and control strategy of quad-rotors lay the ground work for the future research on self-control flight using GPS position control and vision system.

本文对四旋翼直升机的硬件系统和控制方法研究，为以后基于GPS的位置控制和基于视觉系统的自主飞行控制研究打下了坚实的基础。