have has 句子中的意思，解释一下！

这个句子没有提供上文内容，无法所指的特定事物，只能将句子按字面意思翻译如下：

In recent years the focus has intensified as scientists have learned more about its importance.
近年来，当科学家们已经更了解到关于它的重要性，从而更加强了对它的关注。

▲在这里的 has / have 都是过去完成时，后面都加P.P（过去分词）

没有实际意义 是助动词
用在现在完成时

has和have的用法?
都表示“有”
1。只有一般现在时当主语为第三人称单数事，动词用has。否则其余人称都用have。
2。 当疑问词提前或助动词提前时，后面的都用have。
例如：
They have many fruits.
Mary has a hat.
The cat has a short leg.
Does she have a cap?
Do you have a book about America?
What does she have?
What do you have?