瞬间速度，某一时刻物体的速度，矢量，人教版高中必修一课程。
这样，虽然瞬间速度物理真实存在，很困难去计算，因为缺乏精确定义。
Thus, although instantaneous speed is a physical reality, there is difficulty computing it for lack of a precise definition.
5G 网络的速度大约是 4G 的10倍，这意味着你可以使用 5G 网络瞬间就能下载一部电影。此外，虚拟现实游戏将开始变得更受欢迎。5G 将使虚拟现实游戏更加真实。
5G networks are about 10 times faster than 4G. This means you can download a movie in seconds using 5G. Also, VR games will become more popular with 5G. 5G will make the VR games even more real.
关键之处就在于速度，太阳能的传递几乎就在瞬间完成，所以很少能量以热的形式耗散掉。
Speed is the key –the transfer of the solar energy takes place almost instantaneously so little energy is wasted as heat.
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