Leonardo's masterwork -- now nearly 500 years old -- is inspected every one to two years.
Leonardo's masterwork -- now nearly 500 years old -- is inspected every one to two years.
每隔1到2年，就要对这个近500余岁的达芬奇杰作进行一次检查。
Leonardo's masterwork -- now nearly 500 years old -- is inspected every one to two years.
每隔1到2年，就要对这个近500余岁的达芬奇杰作进行一次检查。