Using objects such as mirrors or videorecordings as they practice can show speakers what they look and sound like to the audience.
在练习时，使用镜子或录像等物品，可以展示演讲者在面对观众时他们的样子和声音。
2
The researchers analyzed videorecordings of 53 child-parent pairs during everyday activities at home and found children who play with puzzles between 26 and 46 months of age have better spatial skills when assessed at 54 months of age.