The easier level of the challenge requires flights of 90 seconds and a landing on a small, flat circular pad.

稍容易的初级挑战级别要求飞行90秒，然后在一个小型圆形平台上降落。

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The finite method of EHLwas used to analyze the properties of sector pad and circular pad thrust bearing separately on the condition of centre pivoted.

应用有限元程序分别对圆形瓦和扇形瓦推力轴承在中心支承条件下的性能进行了计算。

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Oscar is carefully mounted on the base, and a circular felt pad is placed on the bottom.

奥斯卡被仔细的装到基底上，一块圆形的棉垫被放在底部。

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Navigating the menus wasn't a hassle with the circular D-pad, and although apps weren't booting instantly, you couldn't call the user experience slow or at all frustrating.

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The Kulluk is a blue and white circular rig with a helicopter landing pad and a tower in the middle.

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