真爱如幽灵，人人对其大发议论，而亲眼目睹者微乎其人。
It is with true love as it is with ghosts: everyone talks of it, but few have seen it.
其调节方式不外乎以下两种：管路特性曲线的调节，如关阀调节；
Its regulation either of two ways: the curve of pipeline regulation, such as customs regulating valve;
如：僖公二十四年《传》：“窃人之财，犹谓之盗，况贪天之功以为己力乎？”
" Such as: Xi public twenty-four years "Biography": "stealing the wealth of people, still called the Pirates, state corruption that has been successful days, almost force?
如：僖公二十四年《传》：“窃人之财，犹谓之盗，况贪天之功以为己力乎？”
" Such as: Xi public twenty-four years "Biography": "stealing the wealth of people, still called the Pirates, state corruption that has been successful days, almost force?
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