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。

youdao

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。

youdao

When is the plane at its highest point of its trajectory and how high is it above the point where it started when it turned the engines off when it went into free fall?

飞机在飞行轨迹的最高点，是什么时候，此时距离出发点，也就是关闭引擎的时刻，高度相差多少？，什么时候开始自由落体？

youdao

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