net change

基本解釋

Rather than simply providing the net change over a period, this approach discloses the components that make up the change.
而不是簡單地計算一個時間段的凈變化，這種方法揭示了引起變化的各個要素。
lssclub.com
If you are measuring volatility as the gross amount of change over time in LOCs, then you will want to measure volume as the net change over time in LOCs as well.
如果您根據(jù) LOC 中的隨時間變更的總量度量易變率，那么您會希望也根據(jù) LOC 中隨時間的凈變更度量容積。
Whereas chemical rockets waste too much propellant to reach a net change in spacecraft velocity, electric thrusters can do exactly the same mission using just a small fraction of the propellant.
鑒于化學(xué)燃料火箭浪費太多的推進(jìn)劑難以實現(xiàn)飛船速度的靜變化，電力推進(jìn)器僅僅使用一小點推進(jìn)劑就可以做同樣的任務(wù)。

Once the gases are mixed, there's not going to be any further net change in the system.
一旦氣體混合,這個系統(tǒng)就不會發(fā)生任何凈的變化。
麻省理工公開課 - 熱力學(xué)與動力學(xué)課程節(jié)選
Now the last thing is that because the neutron has no net charge, we can change neutron number.
現(xiàn)在，最后一件事是,因為中子沒有凈電子，我們可以改變中子數(shù)。
麻省理工公開課 - 固態(tài)化學(xué)導(dǎo)論課程節(jié)選

But it would result in no net change in tax revenues (at least as Romney measures it).
FORBES: How Will Romney Pay For Tax Cuts? Wouldn't You Like To Know.
They cut exposure overall, but did so by cutting 4, 191 gross longs and slicing 3, 927 gross shorts, which made the net change modest.
FORBES: FOCUS: Speculators Cut Bullish Gold, Silver Positions -- CFTC