With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野

The flower bud of a water lily 百合 opens at sunset since .its opening is triggered(commence) .by the decreased light.

All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.

The doctor shares his phone number with the patients __________ they need medical assistance.

The fear of smallpox, which terrorized the eighteenth century, has no analogy(likeness) today.

How many people are aware that a dancer with the New York City Ballet typically wears out a minimum of two hundred pairs of toe shoes per year?

The reason why he adapted to the new situations quickly is that he has a_____ attitude.

Will all those _____ the proposal raise their hands?

We are interested in the weather because it _____ us so directly ------ what we wear, what we do, and even how we feel.

He is a very honest official and never _____ any gifts from the people who sought his help.