The conventional theory of propeller design is mainly for large aircraft.

常规的螺旋桨设计理论主要是针对大型飞机的。

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For example, trained observers obtain a very large amount of information about a star mainly from the accurate analysis of the simple lines that appear in a spectrum.

例如，经过训练的观察者主要通过对光谱中出现的简单线条的精确分析来获取关于恒星的大量信息。

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These are too large for everyday transactions and are mainly used for mattress-stuffing or money laundering, say bankers.

这笔钱对于日常交易而言数额太大了，而且它主要用于储蓄或是洗钱，银行家们说道。

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The large infrastructure requirements have made the technology viable mainly for large enterprises in highly regulated industries.

FORBES: Connect

It was revealed that the radius and contact angle of the legs mainly accounted for the large supporting force, ensuring that the robotic water strider not only stood but also walked on the water surface.

FORBES: A Robot That Walks On Water

This is mainly because it would be improper for a council to change its planning policies because of an offer of a large donation.

ECONOMIST: Newcastle: The best laid plans | The