H=High，是电量充足的意思。
L=Low，是电量低，电量不足的意思。
The job brings with it status and a high income.
担任这一职务既有显贵的地位又有丰厚的收入。
This issue has had a high profile in recent months.
近几个月来，这个议题一直是关注的焦点。
There were low banks of earth between the rice fields.
稻田之间有低矮的田埂。
