Another attractive area is retirement accounts, where ETFs have the potential to become much bigger.
另一个充满诱惑的领域是养老金帐户，ETF有能力在这个领域大展拳脚。
The attractive energy is just the potential energy, Coulombic potential.
引力能就是电势能，库伦电势。
The attractive energy is just the potential energy, Coulombic potential.
引力能就是电势能，库伦电势。
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