1.It is a small device that you move around on a flat surface in front of a computer.
move around 走来走去;绕着……来回转
The planets move around the sun in ellipses.
各行星围绕太阳按椭圆形运转 。
There is no room to move around.
地方太小,倒不开身 。
2.This interferes with the friends' discussion – just as unwanted sales messages interfere with communication over the Internet.
interfere with 干扰,干涉;妨碍;触动或弄坏;乱动;与……抵触
The trees interfere with the view.
那些树挡住了视线 。
Smoking often interferes with health.
吸烟妨碍健康 。