trail vt. 1.拖曳(衣脚等),拖着走;拖带着;提(枪)。 2.跟踪追赶;〔美俚〕落后于。 3.拉长声音讲(话)。 4.〔美国〕踏出路来,开辟道路。 5.〔口语〕在电影预告片中为…做广告;预告;预示。 vi. 1.拖曳;(发等)拖着;(植物)爬在地上;(蛇)慢慢爬行;拖着尾巴;(云霞、烟雾等)飘。 2.拖着脚走 (along); 落在(队伍)后面;(队伍)四散。 3.(道路)伸展;(议论)离题。 4.(猎犬等)追踪猎物。 5.减低、变弱 (away, off)。 trail an oar 拖着桨。 trail mud into the house 把污泥带进屋内。 trail a stranger to see a friend 带着一个陌生人去看朋友。 trail the grass 在草地上踩出一条路。 T- arms 提枪! trailing antenna 【无线电】拖尾天线。 trail off (声音)逐渐消失。 trail on 拖延下去。 trail with 〔美俚〕老和…作伴;和…合作。 n. 1.痕迹,足迹,踏成的路,小路;长长地拖垂后头的东西;(流星等的)尾;衣裙;(云霞等的)尾迹;(炮架的)架尾,车尾。 2.线索,形迹;猎兽的臭迹;(暴风雨等的)余波。 3.【军事】提枪(的姿势)。 4.〔美俚〕邋遢人,〔尤指〕邋遢女人。 at the trail 【军事】取提枪姿势。 be hot on sb.'s trail 紧追某人。 blaze a trail 开路;带头。 hit the trail 出发;立即走开。 off the trail 失去臭迹[线索];迷失。 on the trail 找到臭迹[线索]。 on the trail of 跟踪追赶。 trail after 追随。 trail one's coat [coattails] 故意挑衅。 adj. -able 可用拖车运送的。
Oliver(1942, 1948)has followed meteor trails to measure winds . 奥利弗(1942,1948)曾跟踪流星尾迹测量风。
Oliver ( 1942 , 1948 ) has followed meteor trails to measure winds 奥利弗( 1942 , 1948 )曾跟踪流星尾迹测量风。
Furthermore , meteor trails scattering can affect the performance of a beyond - light - of - sight radar system 最后研究了流星余迹散射对超视距雷达性能的影响。
In this paper the essential characteristics of meteor trails and the reflection and propagation from meteor trails are studied 以圆柱形的电子云为例,研究了欠密类和过密类余迹散射特性。
When radio waves pass through half of the first jump distance , the effects of meteor trails scattering on a radar system are investigated 计算了电波经电离层跳跃前进的过程中,流星余迹散射对后向散射超视距雷达系统性能如作用距离和发现概率等的影响。
Shooting can stop as soon as a bright meteor appears . since the endpoints of the meteor trail and the star trails are captured simultaneously , this helps us identify the meteors exact location and the meteor shower to which it belongs 摄影时,若有明亮流星经过拍摄天空,可立即停止摄影,这样流星迹与恒星流迹的最后一点是在同一时间摄得,便可较易辨别其位置,并确定属于那一流星雨。
The effects of meteor trails scattering on a back scattering beyond - light - of - sight radar detected distance and probability of detection are creatively calculated in theory . it is practicable worth for analyzing the performance of the electronic systems 本文第一次从理论上研究了流星余迹散射对电子系统性能影响,这些结果对研究突发通信系统和超视距雷达系统等电子系统的性能都有一定实用价值。
The effects of the meteor trails orientation on the size and shape of the footprint on the ground are calculated , which the mechanism of good concealment , antijam and low probability of intercept is explained . this method overcomes the classical limitation 其次用数学的方法研究并计算了流星余迹的方位对地面“足迹”的形状和大小的影响,从而揭示了流星突发通信具有保密性好、抗干扰性、抗拦截的物理机制,克服了经典方法的缺陷。