唱歌通常是舞蹈节目中的一部分，而观察者也有机会观察到是谁在唱歌以及其声音特质如何。
Frequently singing is part of a dance program, and again an observer has an opportunity to observe who is singing and the nature of the voices.
超新星爆炸的这种独一无二的环境使得天文学家们有机会观察这些来自超新星的凝结尘埃--这种尘埃在红外线中通常因为太冷而无法放射出光。
The unique environment into which this supernova exploded makes it possible for astronomers to observe the condensed dust from the supernova that is usually too cold to emit in the infrared.
在为他拉票的这个月中，我有机会近距离地观察他的竞选机构。
I had the chance to view that organization up close this month when I canvassed for him.
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