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1·Authentication is a complex problem.

身份验证是个复杂的问题。

2·It was a complex problem.

这是一个复杂的问题。

3·It is a complex problem.

这是一个复杂的问题。

4·That is a very complex problem, he said.

“这是一个非常复杂的问题，”他说。

5·Land use and its change is a quite complex problem.

土地利用及其变化是一个相当复杂的问题。

6·Assembly sequence is an important and complex problem.

装配顺序是一个重要而复杂的问题。

7·Give an example of a time you solved a complex problem.

举一个你解决了某个复杂问题的例子。

8·So don't let us reduce all life to a vast and complex problem.

所以我们不要把所有生活降减为一个复杂庞大的问题。

9·There is much thinking to be done. It's a very complex problem.

需要做大量的思考，这是个非常复杂的问题。

10·It offers a simple solution in a limited domain for a complex problem.

它提供了一个复杂问题在限定领域中的简单答案。