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1·The point is that people grew unaccustomed to thinking and acting in a responsible and independent way. Herein lies another big problem.

关键是人们变得不再习惯以一种负责任和独立的方式去思考和行动。其中就存在另一个大问题。《柯林斯英汉双解大词典》

2·Water is a big problem.

水是一个大问题。

3·Poverty is a big problem around the world.

贫困是全世界的一个大问题。

4·Food waste is a big problem around the world.

食物浪费在世界各地都是一个大问题。

5·Food was a big problem in China in the past.

在过去，粮食是中国的一个大问题。

6·According to a survey, students' safety has become a big problem.

根据一项调查，学生的安全已经成为一个重大问题。

7·Air pollution is a big problem for cities in most countries.

对大多数国家的城市而言，空气污染是一个大问题。

8·One big problem is: what will happen if the flying cars break down?

有一个大问题是：如果飞行汽车坏掉了会发生什么？

9·I think this is also a big problem which needs our great attention.

我认为这也是一个需要我们高度关注的大问题。

10·Garbage sorting is a big problem because there is too much garbage these days.

垃圾分类是个大问题，因为现在垃圾太多了。