have long held back
长期以来
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Fuel cells have long promised pollution-free driving , but have been held back by their enormous cost when applied to a normal car .
燃料电池长期预示着无污染驾驶，但是当它被应用到一辆普通车上时，因其巨额的成本，举步维艰。
youdao
It just traps us in the same debates and divides that have held us back for a very long time and forced us to keep on punting down the road the same problems we've been facing for decades.
WHITEHOUSE: President Obama Addresses Business Roundtable
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