If natural seawater is used , new batch of water should preferably be stored in an empty tank fitted with an effective filtration and disinfection system . the system should be run for at least one to two hours before being used for keeping live seafood 若使用天然海水，每批新到的海水宜贮存于设有有效的过滤和消毒系统的空鱼缸内，并且在饲养活海鲜前，让系统开动至少
A more reassuring introduction for a new governess could scarcely be conceived ; there was no grandeur to overwhelm , no stateliness to embarrass ; and then , as i entered , the old lady got up and promptly and kindly came forward to meet me 对一个新到的家庭女教师来说，也很难设想有比这更让人放心的初次见面的情景了。没有那种咄咄逼人的豪华，也没有今人难堪的庄严。我一进门，那老妇人便站了起来，立刻客客气气地上前来迎接我。
To analyze some key technologies of optical network relative with rwa in detail , such as transmission , switching and internetworking ; to emphasize on the research of function , fabric and performance of optical cross - connection ; to carry out numerical simulations for crosstalk introduced by optical cross connect and to present measurements for suppressing it such as doubly filtering , fixing optimum decision threshold and appropriately choosing the number of multiplexed wavelengths ; 3 . to research the fundamental principle and some problems relative with rwa , including the type of optical network , the type of traffic , the type of service , the survivability of optical network ; to classify and compare rwa algorithms and particularly research some dynamic rwa algorithms ; 4 . to present reserved light - path and classify network resource such as used , unused and reserved status , to emulate establishment of all - optical connection in optical network through modified rwa algorithm and show effectively reducing setup time of all - optical connection utilizing reserved light - path ; to research rwa algorithms of multi - fiber network , to present new link weight functions dependent on node degree , unused fiber ( s ) per wavelength - layer and routing policies , to perform emulation of rwa based wavelength layer graph applying new link weight functions and show them make algorithms better performance and network lower blocking rate ; 5 详细分析了与rwa相关的光网络关键技术，包括传输、交换、组网等，重点研究了光交叉连接的功能和结构、性能，对其引入的串扰进行了详细分析，选择恰当的器件参数进行了数值模拟，并提出了抑制措施(如双重滤波、优化判决门限、选择恰当的复用波长数) ; 3 .研究了光网络的r认叭的基本原理、与r认叭的几个相关问题(光网络类型、业务类型、流量类型、光网络生存性) 、 r认人算法的分类和比较，具体研究了几种动态r场人算法; 4 .研究了以全光连接建立时间为优化目标的r认认算法，提出预置光路的概念，对网络资源进行状态分类(占用、未占用、预置) ，利用改进的r认叭算法仿真，预置光路可为部分新到的连接请求快速建立连接，从而提高网络性能;研究了以多光纤网络连接阻塞率为优化目标的r认城算法，提出了以节点度数、每个波长分层的空闲光纤数以及路由策略决定的几种链路权重函数，利用基于波长分层图模型的并行r场人算法仿真，利用新的链路权重函数使得算法具有更优的性能，使网络具有更低的连接阻塞率。
Often they chose these occupations for lack of other optionsfor instance , civic politicians barred them from employment on city works ! the chinese created their own associations to aid their fellows . associations based on common surnames or place of birth in china provided social activities and social services in chinatown 在与这些新移民打交道时，我还发现，他们普遍存在一个致命的弱点,就是来加拿大前的心理准备不充分，或者说远远不够，我曾专门作过调查，问那些新到加拿大的人：你们在中国辞掉工作，变卖家产，举家"不远万里"来到加拿大。
The curtain rose , as usual , to an almost empty house , it being one of the absurdities of parisian fashion never to appear at the opera until after the beginning of the performance , so that the first act is generally played without the slightest attention being paid to it , that part of the audience already assembled being too much occupied in observing the fresh arrivals , while nothing is heard but the noise of opening and shutting doors , and the buzz of conversation 大幕拉开的时候，象往常一样，戏院几乎是空的，这也是巴黎上流社会的荒唐风气之一，戏不开始是决不肯在戏院里出现的，所以第一幕的演出通常是丝毫没人注意的，那些已经到场的观众也都在忙着在观察新到的看客，那开门关门的闹声，再加上谈话的嗡嗡声，简直使人无法再听到一些别的什么。
