二倍

Employing high-dilute method and 5-fold excess amine prepared two new "two-armed" acyclic diamine intermediates I_a and I_b, which are also intermediates of synthesizing microcyclic compounds, and eight aromatic Schiff bases, II_, were synthesized from reaction of I_a or I_b condensing with different aromatic aldehydes. Their composition and structure were characterized by Elemental analysis, IR, UV-Vis, LIF,~1HNMR and MS. The hydrogen bond interactions and MS fragmental patterns were also discussed.3. Several novel transition metal complexes using II_a as ligand were synthesized and identified by Elemental analysis, IR, UV-Vis,~1HNMR and molar conductivity.

1，采用高度稀释及胺过量五倍的方法合成了两个具有吡啶双酰胺臂的非环二胺Ⅰ_a和Ⅰ_b，并以它们为中间体进一步合成了八个芳香席夫碱Ⅱ_a-Ⅱ_h，通过元素分析及各种波谱测试鉴定了它们的组成与结构，对化合物的UV-Vis、LIF、IR、~1HNMR及MS进行了较为详细的讨论，还探讨了席夫碱的氢键相互作用及质谱裂解方式； 2，以席夫碱Ⅱ_a为配体合成了几个新型的过渡金属配合物，并通过元素分析、UV-Vis、IR、~1HNMR、摩尔电导及DTA—TG对其进行了表征，讨论了化合物的配位情况及配体在配位中的脱质子行为。

The following three disadvantages of power spectrum reprocessing method for pitch detection are found: half pitch error and double pitch error with transition sound; easy distortion in noise speech; the complex method of judging voiceless and voiced speech.

本文分析了功率谱二次处理基音检测方法的不足：对于过渡语音，易产生半频或倍频误判；噪声干扰下，检测结果易失真；清、浊音的判断方法复杂。

At the onset of the war, he had emerged from obscurity with enough money to buy a small swift boat and now, when blockaded goods realized two thousand per cent on each cargo, he owned four boats.

当战争爆发时，他从默默无闻中突然冒了出来，用手头的钱买了一条小小的快艇，而现在，封锁线货物的利润已增加到二十倍，他也拥有四条船了。

Terpenoids are mainly occurred on marine algae, coral, sponge and some fungi by monoterpene, sesquiterpene, diterpene and triterpene. and glycosides with structures of lipid, steroid and terpenoid are distributed to marine algae, sponge, sea cucumber and starfish.

这些新发现的萜类化合物广泛分布于海藻、珊瑚、海绵以及一些海洋真菌等海洋生物中，主要以单萜、倍半萜、二萜、三萜结构型式存在；而糖苷类化合物在海藻、海绵、海参、海星等海洋生物中发现大部分以糖苷脂、甾体糖苷、萜类糖苷型式存在。

Terpenoids are mainly occurred on marine algae, coral, sponge and some fungi by monoterpene, sesquiterpene, diterpene and triterpene. And glycosides with structures of lipid, steroid and terpenoid are distributed to marine algae, sponge, sea cucumber and starfish. Marine organism; terpenoid; glycoside; bioactivity

这些新发现的萜类化合物广泛分布于海藻、珊瑚、海绵以及一些海洋真菌等海洋生物中，主要以单萜、倍半萜、二萜、三萜结构型式存在；而糖苷类化合物在海藻、海绵、海参、海星等海洋生物中发现大部分以糖苷脂、甾体糖苷、萜类糖苷型式存在。

A group of scientists at Carnegie Mellon University in Pittsburgh, Pennsylvania, studied insects like water striders and then built a small robot using ultra-lightweight carbon fiber that is also able to walk on water. But they still have some improvements to make — they said the water strider is able to move about 20 times as fast.

宾州匹兹堡的卡内基美隆大学有一群科学家在研究水黾等昆虫的构造后，利用超轻的碳纤维制作了一个也能在水上行走的小型机器人，但他们仍有一些尚待改进的部分──他们表示，水黾在水面上移动的速度比这机器人快上约二十倍。

The Carina Nebula is home to young, extremely massive stars, including the still enigmatic variable Eta Carinae, a star with well over 100 times the mass of the Sun.

船底座星云是极大质量年轻恒星的家园，范例之一为神秘莫测的变星海山二星(船底座η，Eta Carina)，该星的质量为太阳的百倍以上。

The condition of having three copies of a given chromosome in each somatic cell rather than the normal number of two.

亚倍体的有一组染色体，只有几个染色体比正常的二色染色体少

Mach'.'' 2, it is flying at twice the speed of sound.

假如飞机以二马赫的速度飞行，那么它的速度就是音速的两倍。

In a country twice the size of California but with just two million inhabitants, the major cities, Swakopmund and Windhoek, the capital, feel like prefabricated alien entities plopped down without any local

纳米比亚的面积是加利福尼亚州的两倍，却只有二百万的居民，而国家的主要城市斯瓦科普蒙德和首都温得和克，看起来仿佛是外来的装配式预制产品，丝毫找不到任何的本地宗源。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。