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- The results indicate that compared with the antenna without reflecting structure, the proposed antenna achieves broader impedance bandwidth, increases the forward radiation gain and has stronger backward radiation suppression. 结果表明，与没有地平面反射结构的天线相比，该印制偶极子天线增加了抗带宽，提高了前向辐射增益，抑制了后向辐射。
- He lined out for home without a backward glance. 他头也不回，急忙往家里走去。
- Lead aprons shield people from radiation. 铅做的工作裙可使人免进辐射。
- This part of the country is still backward. 这个国家的这个地区仍很落后。
- In some cities housing conditions went backward. 某些城市的住房条件越来越差。
- The teacher was patient with backward children. 那位老师对迟钝的学童十分耐心。
- He looked backward over his shoulder. 他回头向后看。
- Radiation reached unheard-of levels. 辐射作用已达到前所未有的程度。
- The earth's atmosphere filters out much of the sun's radiation. 地球大气层可以滤掉太阳的大部分射线。
- She looked backward over her shoulder. 她回头往後看。
- Sheila is very clever but rather backward in expressing her ideas. 希拉很聪明，然而在表达思想时却有些腼腆。
- Although he is clever, he is backward in giving his views. 他虽然很聪明，却不善发表他的意见。
- Frank was so backward that he hesitated to ask her to dance. 法兰克非常腼腆,不好意思请她跳舞。
- He had a firsthand taste of life in backward mountainous areas. 他直接体验过落後山区的生活。
- In the accident, the workers received a heavy dose of radiation. 在这次事故中，工人受到大剂量的辐射。
- The most terrifying aspect of nuclear bombing is radiation. 核弹轰炸最可怕的一面是辐射。
- The body cannot tolerate such large amounts of radiation. 身体经不住那么大剂量的放射线。
- The news of the radiation leak caused widespread public alarm. 辐射泄露的消息引起了公众的普遍恐慌。
- backward radiation 逆辐射
- A backward flow of water, as from the action of oars. 反流，逆流向后流的水，如由浆的划动引起
