main technical problem

Because there are plenty of dusty particles and clay mineral in tailings, it is a main technical problem to solidify and dewater the tailings.

尾砂中含有大量的粉粒和粘土矿物，尾砂浆的固结和脱水是尾砂固化的主要技术难题。

The main technical problem was bearing inner diameter profile grinding, during processing new product YA2, so that the diamond contact roller adjuster was designed.

新产品YA2轴承加工中的主要技术难点是轴承内径成形磨削，为此设计了金刚石滚轮修整装置。

The main theories are errors by the pilot or by the air-traffic controllers, a technical problem with the navigation equipment or some combination of these.

主要推断是飞行员驾驶失误或由于空中交通管制，导航设备出现技术故障或者是两者共同所致。