It is subject to change based on the needs of the class.

Davidoff Porcelain Ashtrays, made exclusively for Davidoff by a French renowned manufacturer, are individually hand painted with decorative borders and the Davidoff logo in genuine gold.

大卫杜夫瓷制烟灰缸是法国一家享有盛名美誉的生产商专为大卫杜夫制作，每个烟灰缸用手工涂绘，并以真金绘上饰边和大卫杜夫的商标图案。

Is this bracelet genuine gold?

这个手镯是纯金的吗？

Is this a genuine gold?

这是真金的吗？

This ring is genuine gold.

这枚戒指是真金的。

William bowed to the lady and offered her a little box inside which was a genuine diamond ring.

威廉向那位女士鞠了一躬，送给她一个盒子，里面是一枚漂亮的真钻石戒指。

This is a genuine diamond.

这是一个真的钻石。

He passed it off as a genuine diamond.

他伪称那是真的钻石。

Her wedding ring be make of genuine diamond.

她的结婚戒指是用真正的钻石做的。

It's 1885 and New York City has a big problem.

1885年，纽约面临一个大问题

This is big problem we must work out.

这是很大的问题。我们必须制定。

We would not have to face this big problem.

我们不得不面对这个大难题。

That's going to be a big problem for her.

这对她来说会是一大难题。

Water quality is also a big problem.

水的质量也是一个大问题。

Pollution is a big problem.

污染是个大问题。

Body image – the way people feel about their looks – is a big problem for many young people today.

身体形象即人们对自己外表的感觉，是当今许多年轻人面临的一大问题。

Stress is a big problem for gamers.

压力对于游戏玩家来说是个大问题。

Another big problem is mechanical failure.

另一个大问题是机械故障。

Many people know that rubbish is a big problem on planet Earth.

许多人都知道垃圾是地球上的一个大问题。

It's no secret that air pollution is a big problem for China.

空气污染对中国来说是个大问题，这已不是什么秘密。

But how to get water was a big problem.

但如何取水是个大问题。