The high pressure and low pressure rotors can rotate either in the same or opposite directions. Research about aerodynamics of turbine with or without guide vanes are conducted.

它可以允许轴流式涡轮高低压转子对转或同向旋转，对有或无导叶涡轮进行气动方面的研究工作。

youdao

On test day,all the blind drivers were able to guide the car through the test area without any problems.

VOA: special.2009.11.03

Milton surveys the wealth of literary tradition before him, and he resists its allure without the help of any human guide.

弥尔顿在他之前就调查过文学传统的宝藏，他在没有人帮助的情况下抗拒了这一诱惑。

耶鲁公开课 - 弥尔顿课程节选

For Milton then, at least at that point in his career, his literary career, such a trip without a guide may well have seemed unthinkable.

对于弥尔顿，至少这一点在他的文学职业生涯中,这一趟没有向导指引的旅途是无法想象的。

耶鲁公开课 - 弥尔顿课程节选

When I see the fishing guide's horse without the fishing guide, I know we have a problem.

FORBES: Magazine Article

But without a guide, our visitors couldn't even tell where to start.

CNN: STORY HIGHLIGHTS

In January, a Hamilton County jury acquitted Cunningham of misdemeanor reckless endangerment for sending a father and daughter down the Indian River without a guide.

WSJ: Judge says NY rafter can resume trips with a bond