Only a very sharp-eyed observer would be able to tell that it had once been torn.

In winter, the occasional snowy owl makes an appearance and the sharp-eyed observer may be lucky enough to see one making off with a genuine urban rat.

Mr. Clancy makes a sharp-eyed observer and an emphatically opinionated tour guide through the colliding worlds that he describes.

Until a century ago, any good telescope on Earth, on a good night, could have revealed them for a sharp-eyed observer.

The watercolor illustrations are beguiling, and sharp-eyed observers will be certain the neighborhood Alice explores is located in center city Philadelphia.

A sharp-eyed observer could easily pick out several individuals from virtually every member race of the Federation among the thousands of humans.

The star appears fuzzy to sharp-eyed observers, and the nebulosity is obvious through binoculars or a small telescope.

Mr. Salzman's viewpoint eventually emerges as that of an affectionate and sharp-eyed observer.

Consequently, neither would show much of a cometary coma, and both would be visible only to sharp-eyed observers with telescopes or high-powered binoculars.

A sharp-eyed observer might have wondered why there was no lantern at the entryport-but then, he might think, who was likely to come on board?