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.

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。

How is NASA overcoming this very tiny big problem?

美国宇航局是如何克服这个微小但影响巨大的问题的？