He is an orphan, so he is not sure which family name he should have.
他是个孤儿,因而不知道他自己姓什么。
I go out for lunch at about 12:30.
我在大约12:30去外面吃午餐。
That's right. We will take 10 pigs, 10 sheep and sixty chickens. The chickens can eat the food that we would otherwise throw away. They will provide us with eggs and meat.