Some archaeological sites have always been easily observable—for example, the Parthenon in Athens, Greece; the pyramids of Giza in Egypt; and the megaliths of Stonehenge in southern England.

一些考古遗址一直很容易被观察到——例如，希腊雅典的帕特农神庙、埃及吉萨的金字塔以及英格兰南部的巨石阵。

This is easily observable in many female animals.

你很容易在许多雌性动物身上看到这一点。

The signs of stress and anxiety in dogs are well established, and are easily observable, at least by trained individuals.

而狗狗焦虑和压力大的迹象非常好辨认，至少对于受过训练的人员来说。