环状的

The shape and size of trabeculae, which form the internal bridges between the upper and lower surfaces of the elytra, depend on the species of beetles.

不过，和以往的认识不同的是，两种甲虫前翅的小柱具有类似的结构，它们均为非中空的实柱，并由中心部和环状的几丁质纤维层构成。

A calculation method and calculation results that show that a new kind of shaped paraboloid antennas can produce a ringy radiation pattern is presented.

通过数值计算发现将抛物线绕通过焦点的非抛物线对称轴旋转而形成的赋形抛物面天线可产生环状的方向图主瓣(此主瓣指的是主瓣最大值处)。

"We're talking about these closed loops of time, and the simplest kind of closed loops are circles, which is why we have this ring-shaped hole," Ori explained.

"我们讨论的是这些时间的闭环，最简单的闭环就是圆圈。这就是为何我们有了这些环状的洞"Ori解释道。

The invention concerns a process for preparing heterocyclic carbenes of general formula in which R1, R2, R3 and R4 are identical or different and mean saturated or unsaturated, straight-chain, branched or cyclic, unsubstituted or substituted C1-C10 alkyl, C2-C5 alkylidene, C2-C5 alkylidine, C7-C19 aralkyl or C6-C14 alkyl groups, R3 and R4 can also stand for hydrogen or form jointly anellated, substituted or unsubstituted groups with between 3 and 7 carbon atoms and X stands for carbon or nitrogen, R3 being dropped if X is nitrogen.

本发明涉及一种制备通式Ⅰ的杂环碳烯的方法，其中在通式Ⅰ中，R1、R2、R3和R4是相同的或不同的，并且是饱和的或不饱和的，直链、支链或环状的，未取代或取代的C1－C10－烷基、C2－C5－亚烷基、C2－C5－次烷基、C7－C19－芳烷基或C6－C14－芳基基团，R3和R4可以是氢或它们一起形成具有3－7个碳原子的稠合的、取代或未取代的基团，X是碳或氮，并且当X是氮时，不存在R3。

In the presence of catalytic rhodium acetate, ethyl 2-diazo-3-oxo-per fluoroalkanoates, reacted readily with nitriles to give a series of 5-fluoroalkyl substituted 1, 3oxazoles with high regio-selectivity through a metal carbenoid intermediate. The reactions of carbenoids with noncyclic vinyl ethers or cyclic vinyl ethers afforded dihydrofuroates in good to excellent yields. Interestingly, only vinyl C-H insertion compound was obtained concerning of the reaction of carbenoids with 2, 5dimethylfuran due to the steric hindrance of methyl group

醋酸铑分解2-重氮-3-氧代-全氟羧酸乙酯形成的金属卡宾作为1，3-偶极体，可以与一系列芳基或烷基取代的腈反应，高度区域选择性地生成一系列4-乙氧羰基-5-氟烷基取代的噁唑化合物；也可以与富电子的链状和环状的烯基醚反应，以优良的产率得到一系列氟烷基取代的二氢呋喃类化合物；而与2，5-二甲基呋喃的反应，由于甲基的位阻作用，只得到金属卡宾对呋喃3-位烯基碳氢键插入产物。

Having or consisting of rings or ringlike segments.

环状的，由环构成的有环或环形部分的，由环或环形部分构成的

Taproots stout, branched near stem into a cluster of several long, woody, carrot-like roots with prominent annular scars when old.

坚固的直根，接近茎的分枝形成一束数个长的，木质的，胡萝卜状的根，在老时具突出的环状的痕。

Different from other two plants, there are red materials in upper epidermis of leaves of the A. mono living in Baicheng and Changchun. The red materials may relate to the secretion of salt. In A. mono living in Baicheng ,there exist palisade parenchyma with 2 layers cells.

白城地区的色木槭叶片主脉无花环状的韧皮纤维，白城和长春色木槭均有红色物质从叶片上表皮溢出，与另两种植物不同，这种物质可能与盐分的分泌有关，白城地区的色木槭叶的栅栏组织由两层细胞构成，而长春的色木槭则为一层栅栏组织。

The novel mechanisms probably reflect the behaviors of the linear replicons during evolution, and can also be used to explain why circular genetic maps are generated by these linear chromosomes.

这些奇特的机制可能凸显线状DNA演化上独特的行为，而且能够用来解释为什麼这些线状的染色体所形成的遗传地图却是环状的。

Photo of the Day: Best of October 2007 Lacy breakers lap the coral reef that rings Bora-Bora, an ancient sunken volcano 165 miles (266 kilometers) northwest of Tahiti in French Polynesia's Society Islands.

花边的激浪包围珊瑚礁这环状的波拉－波拉声，那是一个古老沉没火山165英里（ 266公里），西北的塔希提岛，是法属波利尼西亚的社会群岛。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。