The three main reasons are lack of competitive pressure, a tendency to reinvent the wheel and a focus on technology rather than organisation.

这有三个主要的原因：缺少竞争压力、重复建设及注重科技而非管理。

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Colors are traditionally shown in a color wheel, and from this wheel, we can separate colors into three main groups: primary, secondary and tertiary.

色彩按照惯例被显示在色环中，从中我们可以将所有颜色分为三类：基色，次生色和三次色。

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Peeling is the main type of failure of wheel tread.

剥离是车轮踏面失效的主要类型。

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Mr. Berti, 54 years old, said all the stores along the main street of Davis were closed Tuesday and only pickup trucks with four-wheel drive were braving secondary roads.

WSJ: Snow Pummels West Virginia in Sandy's Aftermath

The co-pilot contacted the airline's chief pilot by radio and it was agreed that the crew would use a "left-wing-down" technique ensuring the left main wheels touched down on the runway first, with the remaining right main wheel then being lowered onto the runway as gently as possible.

BBC: Flybe plane passengers 'saw wheel fall off'