查询词典 echolocation

"This echolocation in bats is often compared with radar, the principle of which is similar."

蝙蝠这种回声定位常常可与雷达相比较，其原理是一样的。

It is the only mammal known to use echolocation.

目前它们的数量也需要人们保护。

"This echolocation in bat s is often compared with radar, the principle of which is similar."

蝙蝠这种回声定位常常可与雷达相比较，其原理是一样的。

The reason why there is correlation between echolocation frequency and body size has been discussed.

探讨了影响回声定位声波的因素，并对频率与体型相关关系产生的机理做了分析。

We have only to turn to that extraordinary discovery of echolocation in bats.

要透彻理解这句话的意义，我们应先回顾一下人类最近的几项发明。

They are one of the few mammals that can use sound to navigate, which is a trick called echolocation.

它们是极少数能用声音导航的哺乳动物之一，这种导航方式即所谓的回声''。

In general, echolocation calls are characterized by their frequency, intensity in decibels, and duration in milliseconds.

一般来说，用于回声定位的叫声是用它们的频率、强度以及持续时间来表示特征的。

This echolocation in bats is often compared with radar, the principle of which is similar.

蝙蝠这种回响定位法常拿来和原理与之很相近似的雷达相比。

The echolocation signals of Rhinolophidae and Hipposideridae are both long CF-FM with 1 harmonic and narrow FM bandwidth. But Rhinolophidae has longer duration, higher duty cycle and lower dominant frequency than Hipposideridae. All the echolocation signals of Vespertilionidae are short FM with 2-6 harmonics and wide FM bandwidth. Vespertilionidae has shorter duration and lower duty cycle than the other two families. There are obvious differences in dominant frequency between different species in this family.

菊头蝠科和蹄蝠科回声定位信号均为长CF-FM型，一般具有1个谐波，调频带很窄，但菊头蝠科的持续时间和能率环明显高于蹄蝠科，蹄蝠科能量最大处频率高于菊头蝠科；蝙蝠科回声定位信号均为短FM型，具有2～6个谐波，持续时间和能率环比其他两科低，调频带很宽，能量最大处频率在种间变化较大。

In order to explore the relationship between the echolocation call or signal of leaf-nosed bats and frequency tuning of inferior collicular neurons, the echolocation calls of the leaf-nosed bats were recorded using bat detector and frequency tuning curves of inferior collicular neurons were obtained by extracellular recording.

采用超声监测仪录制超声信号和细胞外电生理记录下丘神经元的频率调谐曲线(frequency tuning curves， FTCs)的方法，探讨了大蹄蝠回声定位信号与下丘(inferior colliculus， IC)神经元频率调谐之间的相关性。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐