The cloning technology can make humans ( ).

克隆技术可能使人变得（多余、可代替甚至是处于灭绝的境地）。

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That changed with the invention of cloning technology.

不过，随着克隆技术的进步，情况变得不一样了。

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But they are difficult to make and require the use of an embryo or cloning technology.

但是制造他们是很困难的，而且需要使用胚胎或者是克隆技术。

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Right now, cloning technology is very unreliable--with only a handful of successes for every attempt in animals.

FORBES: Cloning People Easier Than Profits

In his State of the Union address, President George W. Bush advocated outlawing all use of cloning technology on human cells.

FORBES: Magazine Article

Many doctors, including some at the forefront of cloning technology, have expressed severe doubts about whether the techniques could ever ethically be used on humans.

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