In a recent speech in Iowa, he dismissed wind power as an unreliable energy source.
在最近一次爱荷华州的演讲中，他将风能驳斥为不可靠的能源来源。
The process is cumbersome, expensive, and unreliable.
这个过程繁琐、昂贵且不可靠。
Yes, more investment is needed, but passengers will not be willing to pay more indefinitely if they must also endure cramped, unreliable services, punctuated by regular chaos when timetables are changed, or planned maintenance is managed incompetently.
是的，需要更多的投资，但如果乘客还必须忍受拥挤、不可靠的服务，以及在时刻表变更或计划中的维护管理不善时频繁出现的混乱，他们也不会无限期地愿意支付更多费用。
Although ethics classes are common around the world, scientists are unsure if their lessons can actually change behavior; evidence either way is weak, relying on contrived laboratory tests or sometimes unreliable self-reports.
尽管伦理课程在全球范围内很常见，但科学家们不确定这些课程是否真的能改变行为；无论哪方面的证据都很薄弱，依赖于人为设计的实验室测试，或者有时不可靠的自我报告。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。