For this reason, the samara has no stationary frame of reference, unlike a two-winged helicopter, and appears to fall in a complex way.

因此，翅果没有稳定的参考结构，不像双翼直升机，并且它在降落中呈现出复杂的方式。

youdao

Unfortunately, there are no hard and fast rules on how to frame your research question just as there is no prescription on how to write an interesting and informative opening paragraph.

不幸的是，对如何设定你的研究问题并没有任何硬性规定，正如没有对如何写出有趣和翔实的开头段的规定一样。

youdao

The website must be delivered in a short time frame, no time for training.

而这个网站又必须在短时间内交付，没有时间进行培训。

youdao

The final summit communiqu simply said NATO leaders agreed "these countries will become members of NATO" but no time frame was given.

VOA: standard.2009.09.04

Torrey says it was no small feat composing shots of the ruins without any tourists in the frame, but even more difficult was chasing the ever-changing angles of natural light.

VOA: standard.2009.12.15

The frame is no longer assembled from laser-etched wood, instead there's a powder-coated steel frame with PVC plastic sides to help shield the various moving parts and lend an air of professionalism to the affair.

ENGADGET: MakerBot unveils Replicator 2, 2X and launches retail store, we go eyes-on

They show children propelled high into the air by swings suspended from a 4m-high frame with no safety surface below.

BBC: Wicksteed Park releases archive photos for appeal

You move through a completely blank canvas with absolutely no frame of reference.

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