hel 用英语:

A balloon must be filled with either helium or hydrogen.

It is, moreover, very difficult to explain in any other way why there should be so much helium in the universe.

Even though he apologized, I'm still furious.

Is he sleeping?

He committed suicide.

Last night, he saw a UFO in the sky.

He began to suspect something was wrong when the seller didn't allow him to test the item before buying it.

If a man wants to learn to sound like a native speaker of Japanese, he shouldn't only learn Japanese from women. The reverse is true for a woman.

That dog tries to eat just about anything he lays his eyes on.

Frankly speaking, he is more of a hypocrite than a patriot.

A good newspaper reporter takes advantage of what he learns from any source, even the "little bird told him so" type of source.

Father makes sure that all the lights are off before he goes to bed.

My father said he would reserve a day to take me to the zoo.

She bought him a car, but he didn't have a driver's license so he couldn't drive it anywhere.

My father works hard because he wants to give us everything we need.

I found his new novel very dull. I don't think he is much of a writer.

In addition to being a famous physicist, he is a great novelist.