The Winter Hexagon involves some of the brightest stars visible, forming a large and easily found pattern in the winter sky of Earth's northern hemisphere.

冬季六边形包括一些可见的最亮的恒星，它们在地球北半球的冬季天空中形成了一个大而容易辨认的图案。

youdao

Radio telescopes create pictures of the sky, not in visible light, but in radio waves.

射电望远镜拍摄的天空图片不是可见光，而是无线电波。

youdao

When the real Sun was visible, however, the birds maintained a constant direction as it moved across the sky.

但是，当它们可以看到真正的太阳时，在太阳横跨天空移动时，这些候鸟保持固定的方向。

youdao

Sometimes,observers see this as a comet's tail, which can be visible to the unaided eye stretching across the night sky.

VOA: special.2011.02.09

The Evening Star is the, roughly speaking, first heavenly body that's visible in the sky as it gets dark, at least at certain times of the year.

粗略说来,昏星就是,天黑时第一个能看见的天体,至少在一年的某个时间段是这样

耶鲁公开课 - 死亡课程节选

And if a spacecraft is visible in the sky, you'll be told where to find it.

CNN: The Internet: the final frontier for space watchers

Having nothing better in mind, he hops on board, and the ship sails off, beneath the Golden Gate Bridge, with the Stars and Stripes, at its stern, barely visible under a dying sky.

NEWYORKER: Sail Away

The rocket lit up a clear equatorial night sky and was visible from the ground for over six minutes.

CNN: Ariane rocket orbits U.S. communications satellites