All our family came to our grandfather 's eightieth birthday party .
我们全家和所有的亲戚都来参加祖父的八十岁寿宴。
His hearing deteriorated after his eightieth birthday .
他80岁生日之后,听力就不断恶化了。
About fifty relatives and friends attended his eightieth birthday to do him honour .
大约有五十位亲友前来向他祝贺八十寿辰。
This story is an account of what happens to an old woman on her eightieth birthday .
这个故事记述了一位老妇人八十岁生日发生的事情。
Because the moon has only an eightieth of the earth 's mass .
由于月球的质量是地球质量的十八分之一。
On her eightieth birthday , the old lady hoped the postman could deliver some letters even parcels to her .
在80大寿时,老太太希望邮递员给她送来几封信甚至邮包。
The stamps have been issued to mark the eightieth anniversary of russia 's counter-intelligence service .
这套邮票是纪念俄国反情报部门成立80周年而发行的。
However , as an intelligent trend , positivism was seeded in seventieth century european thought and spread over in eightieth century as forming a seemingly conflict between rationalism and empiricism , under which concealed deeply agreements that distinguished between contingent knowledge of the world and necessary knowledge of the eternal .