up-and-up

例句：

1. 1. The new car is up-and-up, which means it's in excellent condition.
   新车状况非常好。
2. 2. She was up-and-up when she arrived at the airport.
   她到达机场时状态非常好。
3. 3. The teacher praised the students for their up-and-up performance in the exam.
   老师表扬了学生们考试中表现出色的成绩。