科学训练听力速度就要循序渐进，即由慢速到快速，逐步提高。

Scientific training hearing speed will step-by-step, namely the slow to fast, and gradually raise.

youdao

科学训练听力速度就要循序渐进，即由慢速到快速，逐步提高。

Scientific training hearing speed will step-by-step, namely the slow to fast, and gradually raise.

youdao