But economist Jack Strauss says credit conditions threaten the main engine of job growth since two thousand one small businesses.

VOA: special.2009.11.06

If we have a small engine, and we have to pull the car up a steep hill,a difficult hill, the engine is more likely to collapse,to blow up.

如果我们用的引擎很小，想把车开上一个陡峭崎岖的山坡，引擎很容易损毁，爆炸。

哈佛公开课 - 幸福课课程节选

But he says small businesses are the engine of job growth in America, and they are still having trouble getting loans.

VOA: standard.2009.10.21