并且这种情况可以改变。
现在这种情况可以改变了，这个净差额就是为什么银的价格在金之后的主要原因，但是这创造了一个购买白银的机会。
The short position is the main reason why the price of silver is behind the gold price, but this creates the opportunity to buy silver.
从历史上看，大多数汽车都以汽油为燃料，但这种情况在未来可能会改变：汽车也可以使用其他液体燃料和电力。
Historically, most cars have run on gasoline, but that may change in the future: cars can also run on other liquid fuels and electricity.
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