Remember, the Angle between two planes is the same thing as the Angle between the normal vectors.

记住两个平面之间的夹角和，两个法向量之间的夹角是一样的。

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So, see, the lines of intersections between two of the planes, so, here they all pass through the same line, and here, instead, they intersect in one line here, one line here, and one line there.

这个两平面相交得到的直线，两平面都经过同一条直线，此处，另外两平面交成直线，这一条，那一条。

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In recent decades the market has divided between short - and long-haul planes mainly made by two big competitors, Boeing and Airbus.

近几十年，空旅市场分别由两大劲敌波音和空客公司制造的短途和长途运输客机瓜分。

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He must also impose at least two of six possible penalties, which include flight restrictions on Syrian planes and the limitation of diplomatic contact between the two countries.

BBC: NEWS | Middle East | Syria under US sanctions threat

Parts of the planes and debris were scattered between the two crash sites in a secluded and difficult to access area, state police said.

CNN: STORY HIGHLIGHTS

The assets also include two of the airline's helicopters, buses used to ferry passengers between planes, and the terminal and other machinery at the airport, Mr. Acharya said.

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