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1·Mars is too faint and too low in the sky to be observable.

火星太暗，在空中位置太低，所以观测不到。《柯林斯英汉双解大词典》

2·In contrast, high-frequency fluctuations such as seasonal temperature variations are observable and somewhat predictable, so that groups could have adapted their behaviors accordingly.

相反，诸如季节性温度变化等高频波动是可以观察到的，而且在某种程度上是可以预测的，因此群体可以相应地调整它们的行为。

3·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。

4·Similar trends are observable in mainland Europe.

类似的趋势在欧洲大陆也能见到。《牛津词典》

5·It's not an externally observable characteristic unless you want to flaunt it.

除非你想炫耀它，否则它不是一个外在可见的特征。

6·From end to end, the Milky Way's starry disk, observable with the naked eye and through optical telescopes, spans 120,000 light-years.

从一端到另一端，银河系布满星星的圆盘横跨12万光年，可以用肉眼和光学望远镜观察到。

7·The planet Venus takes 243 earth-days to turn once on its axis, so incoming heat from the sun is added and distributed at a more leisurely, observable pace.

金星自转一周需要243个地球日，因此来自太阳的热量以更悠闲、更容易观察到的速度被吸收和分配。

8·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。

9·It should yield an observable result or value for the actor.

它为参与者产生了一个看的见的结果或数据值。

10·We'll start with the basic observable component modeled in Figure 8.

我们可以开始于在图8建模的基本被观察组件。