The in-plane free vibration frequencies and nonlinear internal resonance of circular arches were studied.

对圆弧拱面内自由振动的频率和非线性内共振现象进行了研究。

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As for us, we've started using our plane time as a work-free zone, and thus time to dip into the recovery phase.

对于我们来说，我们已经开始将飞行时间用于休息，从而有时间渐入恢复阶段。

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This is the plane while it is in free fall.

这就是在自由落体的飞机。

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From under the plane's right wing, the black sharp-nosed X-15 drops free.

VOA: special.2010.07.07

In the spring Herrick plans to fly in a decompression chamber so that divers can spend more time clearing the plane free from the bottom's anchoring debris.

FORBES: Barnstormer

Better to know the model you are using, if only to understand its limitations, than to kid yourself you have moved to a deeper, model-free plane.

ECONOMIST: Knowing your place

Nadia Bowers is often hilarious as the narcissistic Susan, whose shifty means of procuring a free plane ride to Minneapolis will soon spell trouble for her sister and brother-in-law.

WSJ: Review: Moore's 'Collapse' is a trenchant comedy