middle aged 是什么意思

	1.	Few of the adventurers lived beyond middle age . 能活到中年的冒险家为数很少。
	2.	Interlibrary lending was not unknown in the middle ages . 中世纪已经有了馆际互借。
	3.	She did not get married until she was well into middle age . 她步入中年以后才结婚。
	4.	She also dreaded falling prey to the diseases of middle age . 她也害怕中年人容易染上的疾病。
	5.	He knew more about the middle ages than any man alive . 比起同时代的人，他对中世纪更有些研究。
	6.	In the middle ages a gentleman did not engage in economic production . 在中世纪，绅士不从事经济生产。
	7.	Through the middle ages new written works on botany were very rare . 整个中世纪，有关植物学的新著作甚少。
	8.	Religion had an intimate association with alchemy during the middle ages . 在中世纪，宗教和炼金术密切相联。
	9.	The student was out of his depth in discussion on the middle ages . 那个学生对关于中世纪的讨论感到难于理解。
	10.	They were along in the hotel but for a fat french woman of middle age . 旅馆除了他们，还有一个肥胖的中年法国女人。

middle aged是什么意思