四倍

The startling numbers conjure upimages of mass migrations and the trebling or quadrupling in sizeof big cities such as Beijing, Shanghai and Guangzhou.

这些令人吃惊的数字，不禁让人脑海里浮现出大规模人口迁徙、北京、上海和广州这样的大城市人口规模增长三、四倍的情景。

A radio over fiber system to generate optical millimeter wave with four time frequency of the local oscillator frequency using two-cascaded intensity modulators based on optical carrier suppression scheme was investigated numerically and experimentally.

研究了一种采用两个级联外部调制器基于光载波抑制原理产生四倍频毫米波的光纤无线通信系统。

Photo-cathode superconducting accelerator experiment system includes Nd:YAG mode-locked laser, Cs 2Te cathode, 2+1/2 RF gun, L band 3.5MW microwave source, 1.3GHz superconducting cavity, 500W continuous microwave source, coaxial input coupler, 4.2K cryostat, helium liquified system, control system, beam diagnosis system, and vacuum system.

光阴极超导加速器实验系统由四倍频 Nd：YAG锁模激光器，Cs2 Te光阴极，2 +1 / 2微波电子枪，L波段 3 。5 MW脉冲微波源，1 。3 GHz单腔超导铌腔，5 0 0 W连续微波源，超导腔束管耦合器，4 。2 K低温恒温容器，液氦制冷系统，同步控制系统，束流参数诊断，真空系统等构成。

Smearing apical point with a mixture of 0.2% colchicine plus adeps lanae and 1.5% DMSO was also effective with doubling frequency 14.0%. Dripping the apical point of plantlets with trifluralin has also been tested, and it showed effective in inducing tretraploid from double haploid, but obviously delayed plant growth.

本试验还用具有抗微管形成的除草剂氟乐灵进行黄瓜幼苗滴苗加倍试验，试验结果表明，在进行黄瓜双单倍体诱导纯合四倍体时，氟乐灵具有使染色体加倍的功能，但同时也具有延迟处理植株生长的作用。

Tetraploid induction from double haploid was also studied, and a desirable result has been obtained. Dripping the apical point of plantlets with 0.2% colchicine plus 1.5% DMSO was a suitable treatment with doubling frequency 18.2%.

其中0.2％秋水仙素+1.5％DMSO滴苗处理，效果较明显，加倍频率达18.2％。1％秋水仙素+羊毛脂膏+1.5％DMSO涂抹生长点试验，加倍率为14.0％，由于此法田间工作量小，不失为双单倍体诱导纯合四倍体较好的方法。

Additionally, several types of chromosome aberrations were observed in somatic cells of the normal alpacas .

此外，本研究还观察到正常羊驼染色体畸变类型，包括数目畸变和结构畸变，数目畸变如三倍体、四倍体；

Base on the analysis of the grating linear displacement measurement theory,t he measure errors especially the subdivision error of the grating scale,this paper focuses on the theory of switch and merge of dual grating scales'signals,builds the design criteria of high speed high precision displacement measurement by using dual grating sales,designs the switch picking reference with high precision and fast switch and merge method,analyses the errors brought in by switch and merge of the duals grating scales.

针对光栅尺的电子细分信号具有细分误差的特性，本文提出了对莫尔条纹信号不细分的方法以提高双光栅尺信号切换合成值的精度。经过对双光栅计数切换基准、切换与合成特征和规律的探讨，本文设计了实现双光栅尺双重测量、计数值切换合成法的硬件电路，主要通过可编程芯片FPGA，设计了双光栅尺信号处理的各电路模块，如双光栅尺信号四倍频辨向模块、速度判断模块、切换模块、计数值合成处理模块。

This further expanded the special zones to encompass almost all the coastal area, formalised that foreign investors would no longer be required to seek out joint ventures, and promoted even more tax and regulatory breaks for foreign capital. In the decade from 1978 to 1988, foreign trade quadrupled as foreign capital poured in and Chinese export capacity increased.

这进一步扩张了经济特区的范围延伸至几乎整个沿海地区，形成了外国投资者不再需要寻求合资企业，甚至在税制和管理上放开约束鼓励外来资本投资的环境。1978到1988这十年里，由于外商的投资，外贸交易增长为原来的四倍，中国的出口能力加强了。

Furth ermore, there has been a fourfold increase in sales of food products containin g kiran, a substance that a scientific study has shown reduces cholesterol.

而且，含有kiran的食品销量增长了四倍，在一次科学研究中发现kiran是一种能够降低胆固醇水平的物质。

Gigas eggs, if selected for large size, can gie iable tetraploid offspring.

可以产生可存活的四倍体后代。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。