掩蔽

Dick was a habitual thief but he had covered his tracks too well to be convicted .

狄克是个惯偷，但他将罪证掩蔽得很好，结果没有被判罪。

Sometimes pierre remembered what he had been told of soldiers under fire in ambuscade when they have nothing to do , how they try hard to find occupation so as to bear their danger more easily

有时皮埃尔回忆起他所听到的故事，故事中谈到，士兵们作战时处于枪林弹雨之下，他们躲在掩蔽体内，这时无事可做，为了经受起危险造成的威胁，他们尽可能给自己找点事情做。

In the time of elite higher education, the merit of individuality was sheltered by the value of pure knowledge, state paramount benefit and benthamism. Only when the affluent society has come, will the masses have more opportunities to receive higher education so as to embody the value of individuality.

在精英高等教育时代，个性的价值一直处于受掩蔽的状态，它受到纯知识的价值，国家利益至上的价值，以及物质实效的价值等掩蔽，只有在物质基础高度发达的今天，才可能为大众提供充分的接受高等教育机会，也才能使个性的价值得到张扬，唯此时，人们才会把个性价值的充分展现看成是一切创造力的源泉。

Masking can also produce the phenomenon of residual inhibition, where the reduction or elimination of tinnitus perception continues for a short time after the masker is removed.

在掩蔽仪器取走后的一段时间内，掩蔽还能产生残余抑制现象，让人们仍然感受不到耳鸣所带来的困扰。

The results showed that:(1) The characteristic frequency of IC neurons of house mouse was increased with increasing recording depth, and the masker intensity used was positive relevant to the IC neurons\' minimum threshold. When the minimum threshold was high, the masker intensity needed was loud, vice versa.(2) According to the masking rate at MT+10dB of IC neurons to frequency modulation and tone burst, the IC neurons were classified as three types: type I neurons ( 72/113, 63.7%), in which the masking effect of TB was better than frequency modulation ;type II neurons (32/113, 28.3%), in which the masking effects of the two maskers were same; type III neurons( 9/113, 8.0%), in which the masking effect of FM was better than TB.(3) Type I neurons, the minimum threshold of which was low, but the Q_(10) and DR values of which were large; in type III neurons, the minimum threshold was high, the Q_(10) and DR values were narrow; in type III neurons, the MT Q_(10) and DR values were in between.(4) Both FM and TB could make the MT of type I neurons shift upward distinctively, but the effect of TB was more significant than FM.(5) The Q_(10) values of type I neurons became narrower under the influence of TB, were unaffected under the influence of FM.

结果显示：(1)小鼠下丘神经元的特征频率随着记录深度的增加而增高，掩蔽声强度与神经元的最小阈值呈正相关，即对高最小阈值的神经元进行掩蔽时需要的掩蔽声强度高，对低最小阈值神经元进行掩蔽需要的掩蔽声强度低：(2)根据调频声(frequency modulation， FM)和短纯音(tone burst， TB)对下丘神经元阈上10dB处反应的掩蔽，将小鼠IC神经元分为三类：Ⅰ类神经元(72/113，63.7％)，短纯音的掩蔽效果比调频声更好；Ⅱ类神经元(32/113，28.3％)，两者对神经元声反应的掩蔽率相同；Ⅲ类神经元(9/113，8.0％)，调频声的掩蔽效果更好；(3)Ⅰ类神经元的最小阈值低、Q_(10)值和动态范围大，Ⅲ类神经元最小阈值高、Q_(10)值和动态范围小，Ⅱ类神经元的最小阈值、Q_(10)值和动态范围介于Ⅰ和Ⅲ类神经元之间；(4)短纯音和调频声都可以使Ⅰ类神经元声反应的最小阈值明显上移，但短纯音使神经元最小阈值的上移更显著：(5)短纯音使Ⅰ类神经元的Q_(10)值变小，调频声使神经元的Q_(10)值增大不显著，短纯音与调频声对神经元Q_(10)的影响差别显著；(6)短纯音与调频声都使神经元的动态范围减小，并且作用显著，但短纯音的效果更显著：(7)短纯音与调频声都使神经元反应的潜伏期延长，效果显著，但TB的延长作用更为显著；(8)随着探测声强度的升高，短纯音和调频声对Ⅰ类神经元声反应的掩蔽率都降低，但在各个探测声强度短纯音的掩蔽率都比调频声高。

The probe was tone burst and its frequency was the same as neuronal characteristic frequency . The effects of different maskers on the minimum threshold, response latency, dynamic range and firing rate of the mouse inferior colliculus neurons were observed in the experiment.20 healthy adult mice 20-25 g.

探测声频率为神经元的特征频率(characteristic frequency， CF)，掩蔽声分别为和神经元CF相同的短纯音掩蔽声和上扫调频掩蔽声(up-sweep frequency modulation masker)。

Reaction time, mean fixation time, saccade numbers, and initial saccade latency were all affected by the size of the foveal mask.

搜索反应时、眼跳数量、平均注视时间、初始眼跳潜伏期均受移动掩蔽范围的显著影响，它们均随移动掩蔽范围的逐渐增大而呈现上升趋势。即移动掩蔽干扰了中央视觉信息加工。

After it was adjusted with ammonia until the test paper turned purple,in subacid medium of pH 6～7 ammonium acetate buffered solution,bivalent nickel was precipitated quantificationally by dimethylglyoxime.

试样以稀硝酸溶解高氯酸冒烟后，酒石酸掩蔽剂将铁等干扰元素配位掩蔽，以氨水调节至刚果红试纸呈紫色后，在pH6～7的乙酸铵缓冲溶液微酸性介质中，二价镍定量地被丁二酮肟沉淀。

The effect of aluminium and iron on the determination of barium can be overcome by complexing them with triethanolamine and 1,10-phenanthroline.

加入三乙醇胺和邻菲罗啉掩蔽样品中大量的铝、铁，加入氟硼酸钾掩蔽钙，可直接测定硅铝钡合金中钡含量。

After dissolution, the Cr in samples was oxidized to Cr with KMnO4.Fe(superscript 3+) and Cu(superscript 2+) were masked with NH4HF2 and thiourea, respectively. In acid solution at pH 3.0-4.0, the I2 generated from the reaction of Cr and KI could form high-sensitivity blue complex with starch. The absorbance was measured spectrophotometrically at 590 nm.

样品溶解后，用KMnO4将Cr氧化为Cr，以NH4HF2掩蔽Fe(上标 3+)、硫脲掩蔽Cu(上标 2+)后，在pH3.0~4.0的酸性溶液中，Cr与KI作用后生成的I2遇到淀粉后形成灵敏度很高的蓝色络合物，此络合物最大吸收波长为590nm。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。