All the students sat up straight and waited for the test to begin.
所有的学生都坐直了，等待考试开始。
2
After hearing the teacher's words, all the students sat up straight and waited for the test to begin.
听了老师的话，所有的学生都坐直了，等待考试开始。
3
You can load the data straight into the test environment, read it into data files for processing later, or read it in real time and convert it as you use it.