scientists的词性

是名词，例如：

1、Scientists are still a long way off finding a cure.科学家要找到一个治疗方法，还远着呢。

2、The scientists are taking water samples from the river.科学家正从河中采水样。

3、Scientists continue to push back the boundaries of human knowledge.科学家不断扩大人类知识的范围。