The log-period dipole array is applied as a feed element for a back-fire antenna.
用对数周期振子阵作为背射天线的馈源。
Even the popular boy wizard Harry Potter has to battle a deadly dragon and get back a golden egg from its nest in "Harry Potter and the Goblet of Fire".
甚至在著名的小说《哈里·波特和火焰杯》里，小巫师哈里·波特也要打败一条凶恶的龙，从它的巢穴里抢回金蛋。
"Mr.Reid says a tree gives back something for everything you do for it." my younger son remarked one evening as we sat before a blazing fire. "He says we must never waste anything a tree gives us." I.
一天晚上，我们坐在烧的正旺的火炉边，我的小儿子说：“里德先生说，你为树做的每一件事，它都会给你一些回报。”
Gently, very gently, he took her arm and led her back to the hearth and the blazing fire.
轻轻的，非常的轻，他抓住了她的手臂，将她引向壁炉和那熊熊火焰。
The charcoal history of fire in the giant sequoia groves extends back more than 8,000 years.
木炭记录的巨杉林火灾历史可以再向前追溯8000多年。
We're falling back! Covering fire!
我们要撤了，掩护射击！
Tomorrow evening when the enemy arrives, abandon camp. At the fire signal, turn back upon them.
来日黄昏，敌军必到，主公便弃营而走；但见火起，即回军掩杀。
After a long hike, they went back to their camp, built a fire and cooked dinner.
长途跋涉后，他们回到营地，生了一堆火，做了晚饭。
Before he came back home from his work of an evening, she would arrange his arm-chair and woollen slippers before the fire with her own hands.
在他夜晚下班回来以前，她就亲手把他的扶手椅子和毛绒拖鞋放在炉火前面。
The local fire department blocked the road with fire trucks and turned back motorists.
当地消防局用消防车把路挡住，让过往的车辆掉头返回。
So think back to those fire-safety lessons you learned in grade school.
所以回忆下上小学时候学的消防安全课。
We moved back and forth between her bedside and the fire-lit den, holding her hand and talking to her, telling old stories and laughing and crying as simply as children.
我们在她和燃烧的炉火旁来回走动，握着她的手，跟她说话，给她讲老故事，笑着，哭着，就像单纯的孩子。
Police in full force on horseback and on foot kept the crowd back, while all the fire brigades in Berlin poured water on to the flames.
警方动用骑警和人墙全力控制人群，同时，柏林所有的消防队都投入了灭火工作。
I was playing with fire here when I asked her, what it was about me that she disliked or liked? I knew I was not going to like the answers I got back but I had to ask anyway.
我知道这样做是在玩火，不过我还是问，她喜欢我和不喜欢我哪些地方？
A Harvard anthropologist has proposed that using fire to cook food could be dated back to almost two million years and that it could explain hominid features like having a large brain and small teeth.
哈佛大学的一位人类学家提出，用火做饭可以追溯到近200万年前，这可以解释人类的一些特征，比如大脑大，牙齿小。
Deciding the trees would give better cover, they extinguished their fire, then clambered back up the incline, their voices fading away.
决定树荫下更隐蔽后，他们便把火熄灭了，往坡上爬去，说话声渐渐减弱，听不见了。
A second possibility, for more power-hungry devices, is to fire a finely focused infrared laser beam at a photovoltaic cell, which converts the beam back to electrical energy.
第二种可能性则能应用在更加耗电的设备上。其原理是发射一道精确聚焦的红外激光线，击中光伏电池，由此能够将光束转换回电能。
How sure would he need to be about the identity of an attacker to "fire back"?
为确定攻击者身份并“反击”，他需要多大把握？
If I do want a shot with the background dark simply move the dial back to "p" mode and fire away. Nothing else needs to be adjusted.
如果我想要拍摄背景暗下来，只要把拍摄模式转盘转到P程序模式拍照就可以了，不需要其他任何改动。
All her hair was burned off in the fire, but the doctors have promised that it will soon grow back.
她的头发在大火中烧掉了，但医生们保证她的头发还会长起来的。
Leaning back, she folded her arms behind her head, and looked at the fire under drooping LIDS.
她身子向后一仰，两只胳膊交叉放在脑后，眼睑垂下，望着炉火。
They came back to camp wonderfully refreshed, glad-hearted, and ravenous; and they soon had the camp-fire blazing up again.
他们回到营地时神清气爽，兴致勃勃，却也饥肠辘辘；不久，他们又把篝火点着了。
When an exception is thrown during processing of a trigger, the trigger aborts, and the entire statement that caused the trigger to fire is rolled back.
当在触发器的处理过程中抛出异常时，触发器终止，导致触发器触发的整个语句回退。
It takes a month for the body to make antibodies to a newly encountered pathogen, so a bunch of immune-system cells called B lymphocytes first fire back in a general way.
新的病原体进入机体后，机体一般需要一个月的时间才能产生相应的抗体，因此首先由免疫细胞——B淋巴细胞通过共同途径对病原体进行攻击。
To their surprise, they found that it climbed over to the fire alarm on the back wall and set it off!
令他们惊讶的是，他们发现它爬到了后墙的火警警报器上，拉响了警报！
To their surprise, they found that it climbed over to the fire alarm on the back wall and set it off!
令他们惊讶的是，他们发现它爬到了后墙的火警警报器上，拉响了警报！
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