实验过程中校正方便，直观。
During the experiment, the correction is convenient and visual.
先进的电源管理技术提供多种充电方式，真正方便使用。
Advanced power management can provide with various charge modes to make it truly easy to use.
为了方便，正方向设为向下，方向如何取并不打紧，还有重力mg的-，作用。
And just for my convenience I call this now the plus direction just for my convenience — it doesn't really matter So now we have here mg — that is gravity acting upon you.
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