The boat leaves Liverpool on the fifteenth, but before we set sail(for New York) I have to spend a few days in Scotland.
船十五号离开利物浦, 但是(开往纽约)之前, 我得在苏格兰呆上几天。
He traces his family back to about the fifteenth century.
他把他的家世追溯到十五世纪前後。
Most students in this class are fifteen.
这个班的大多数孩子都十五岁。
