Synthesis and Catalytic Activities of Bicyclic Chiral Ammonium Salt Phase-Transfer Catalysts Based on Natural Amino Acids

Bicyclic Graphs with Minimum Wiener Index

具有最小Wiener指数的双圈图

Secondly, starting from phosphorus oxychloride, pentaerythritol, neovaricaine, methacryloyl chloride and hydroxyethyl acrylate, the monomers 3 and 4 which containing the chemical structure of caged bicyclic phosphate were synthesized.

第二部分以三氯氧磷、季戊四醇、乙醇胺、甲基丙烯酰氯以及丙烯酸羟乙酯为原料，合成了含有双环笼状磷酸酯结构的丙烯酸酯单体3和4。

Synthesis of 2,3,7-three substituted bicyclic pyrazolines

2，3，7－三取代双环吡唑啉的合成

Synthesis about a kind of expanding monomer with bicyclic ortho ester group

双环原酸酯类膨胀单体的合成

The calculation of double bond~ ( 13) C NMR chemical shift in bicyclic and polycyclic compounds

双环和多环化合物中双键~（13）c NMR化学位移计算

She tried to get a grip on the icy rock.

她尽力抓住那冰冷的石头。

Try to avoid going outdoors in very cold or icy weather.

在寒冷或冰雪覆盖的天气尽量不要外出。

We stood shivering in the icy wind.

我们站在刺骨的寒风中，浑身直哆嗦。

The icy wind never let up for a moment.

刺骨的寒风一刻不停地刮着。

An icy wind blew hard across the open spaces

刺骨的寒风于开阔处呼啸着。

They were chilled by the icy wind.

凛冽的寒风吹得他们遍体冰凉。

An icy wind swept through the streets

一阵寒风扫过街道。

The icy wind had blasted the new spring growth.

寒冷的风摧残了春天才生长出来的东西。

Although highly technical clothing provides much protection against the extreme cold, scientists often need to go outside when there is an icy wind blowing and the temperature is-30 ℃.

尽管用高科技制造的衣物御寒很有效，但科学家们经常要顶着暴风雪和-30度的低温外出。

There was an icy wind blowing outside.

外面正刮着凛冽的寒风。

His cheeks were stinging from the icy wind

刺骨的寒风吹得他脸颊生疼。

That was when Xiangzi liked taking the rickshaw out. The icy wind would funnel up his sleeves making him shiver as if taking a cold bath.

祥子愿意早早的拉车跑一趟，凉风飕进他的袖口，使他全身像洗冷水澡似的一哆嗦，一痛快。

The problem appears to occur when the ABS is engaged on bumpy, wet or icy roads.

当汽车在不平坦、潮湿或结冰路面上使用ABS系统时，似乎会出现以上问题。

Driving through snowstorm on icy roads for long distances is a most nerve-racking experience.

在暴风雪中驱车长距离地行驶于冰雪覆盖的路面上是一种令人非常紧张的经历。

The accident taught me a lesson; I won't drive fast on icy roads again.

那场意外给了我一个教训；我再也不在结冰的路面开快车了。