- All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
- The flower bud of a water lily 百合 opens at sunset since .its opening is triggered(commence) .by the decreased light.
- Food must be moist in order to have a taste.
- With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野
- Some children display an unquenchable 难以抑制的 curiosity about every new thing they encounter.
- Some animals pant and sweat to speed evaporation of body moisture and thus cool themselves.
- Double Eagle in the first transatlantic balloon, was greeted by avid crowds in France.
- By the nineteenth century, embroidery on men's clothing had virtually disappeared except for the occasional decorative vest and tie.
- The Salk vaccine is a major factor in the fight to eradicate polio.
- Comets are still regarded with awe by some people.
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