Only metals which exist as free elements can be extracted by physical methods. These metals include gold and silver.

只有以自由态的形式存在于地壳中的金属才可以用物理方法来提取，这些金属包括金和银。

youdao

All told, there's a small deluge of new features that could amount to a lot, even excluding new hands-free elements like Smart Scroll.

ENGADGET

As the problems of ObamaCare inevitably emerge, the big question will be whether they will be blamed on the residual free-market elements of our health system or on the new government controls.

FORBES: The Battle Of The Narrative: How Ordinary Americans Can Fight ObamaCare

Unfortunately, it is not the democratic, free market-oriented elements with whom President Boris Yeltsin has been associated in the past.

CENTERFORSECURITYPOLICY: Center For Security Policy