If there is no cycle, return null.
如果没有环，则返回空。
There would be no cycles save for the never-ending cycle of ingratitude.
从此除了忘恩负义的无休止循环将不再有其他循环了。
CONNECT_BY_ISCYCLE returns a small integer value that is set to either 0 (no cycle detected) or 1 (cycle detected).
CONNECT _ BY _ ISCYCLE返回一个设置为0(未检测到循环)或1(检测到循环)的小整数值。
Since 1930, no cycle has seen corporate credit spreads narrow so much so quickly, suggesting a rush to anything that pays a yield.
自1930年以来，没有哪个经济周期的企业信贷利差像现在这样快速大幅收窄，这似乎表明人们在一窝蜂追逐任何能产生收益的资产。
The Underdark did not know seasons and had no cycle of light and dark, but the drow still went about their business according to the ancient, forgotten rhythms of their light-dwelling ancestors.
而幽暗地域并不知道春夏秋冬四季变幻，也没有光与暗的往复循环，但是卓尔仍然根据古代早已被遗忘的地表生活祖先们的规律生活着。
Conventional wisdom would seem to suggest that companies have no incentive to lengthen the life cycle of their products and reduce the revenue they would get from selling new goods.
传统观点似乎认为，企业在延长产品生命周期和减少销售新产品的收入方面是没有动力的。
The cycle begins again until there are no more balls in the top of the clock.
循环会再次开始，直到时钟的顶端没有球。
No one knows when the credit cycle will end, he says.
他说：没有人知道信用循环什么时候会结束。
This results in no working software until very late in the cycle.
这会导致没有可用的工作软件，直到周期的晚期才会改变。
So objects that become garbage shortly after allocation contribute no workload to the collection cycle.
所以在分配之后很快就变成垃圾的对象，不会造成收集周期的工作量。
If a change in the jet stream really is a leading indicator of solar activity, then no new cycle is on the horizon.
如果高速气流的变化真地是太阳活动最重要的指示物，那么新的太阳活动周期还未露端倪。
No matter where you host your community, maintain a presence everywhere appropriate throughout its life cycle, and don't let those connections wither.
不管您的社区宿主在什么地方，要在它的生命周期内将其延伸到所有适合的地方，并且要维护这些关系。
No Dickensian insights are necessary to appreciate the scale of human intervention in the nitrogen cycle.
在理解人类对氮循环的干扰力度方面，并非是杞人忧天。
If you are required to display a collection of data retrieved from the service layer on this page, there is just no good opportunity in the JSF life cycle to fetch the data.
如果需要在该页面上显示从服务层获得的一组数据，那么在JSF生命周期中始终没有好的机会来取数据。
Its release cycle can be erratic, though, and there is also no 64-bit version of the software.
不过它的发布周期并不稳定，而且也没有64位的版本。
While the lost events may seem like an exceptional condition, it raises no red flags in the JSF life cycle.
虽然丢失的事件看上去像是异常状况，但并不会导致JSF生命周期中出现红色标志。
"There's just no end to it once the cycle starts," says Robert Solomon of Yale Law School.
“循环一旦开始就会没完没了，”耶鲁法学院罗伯特·所罗门说。
The long-term trend in profitability (claims and operating costs as a percentage of premiums) for America’s non-life insurers shows no obvious correlation with the economic cycle.
长期趋势显示，美国非寿险公司的收益率（理赔金和运营成本之和与保费的百分比率）和经济周期没有明显的相关性。
The customers interviewed for this article reported having no required approval cycle or controls to restrict content.
我们访问的客户表示他们没有使用批准周期或控制来限制内容。
Just take a look at the figures. But in the early stages of a rising equity cycle, no one says it's a bull market.
但是，在上升周期的初期阶段，没有人会说我们处在牛市。
A two-stroke engine has no moving valves, and the spark plug fires each time the piston hits the top of its cycle.
二冲程发动机没有移动的阀，火花塞每次点火活塞到达循环顶端。
There is no doubt in my mind that the GNOME release cycle was created for marketing reasons.
我没有怀疑GNOME的发报周期是为市埸原因制定的。
Postscript drives the Dojo widget life cycle methods, but provides no benefit to a standard Dojo class.
postscript产生了Dojo小部件生命周期方法，但对标准dojo类没有什么用处。
Worse, a fixed allotment of permits makes no adjustment for thebusiness cycle (firms produce and pollute less during a recession).
更糟糕的是，这种行政许可的分配对于商业周期几乎不敏感（在萧条时期，企业的生产和排放会降低。）
With Web 2.0, there is no release cycle or upgrade path; you are always using the latest version.
对于Web 2.0而言，没有发行周期或升级路线，您总是使用最新的版本。
Some objects are intended for only one request cycle; after the request is completed, they are no longer useful.
一些对象只在一个请求的处理周期中存在；请求完成之后，就不再需要这些对象了。
The conference will also hear the results of a California University study which found that women on their third IVF cycle were no more likely to conceive than those receiving no treatment.
会议上还将公布加州大学研究的结果，他们发现，与未接受过体外受精治疗的患者相比，在第三个体外受精周期的妇女很难怀孕。
Without goals, I was going around in circles, caught in a debt cycle from which there seemed to be no escape.
没有目标之后，我就不断地在原地转圈，被债务追着跑，却始终逃不出这个圈子。
More significantly, as testing occurred throughout the cycle, there was no longer an 11-day lag in giving a qualitative view of the final build.
更重要的是，在测试循环中出现的测试中，不再存在对最终构建质量上的观察的11 天的延迟。
More significantly, as testing occurred throughout the cycle, there was no longer an 11-day lag in giving a qualitative view of the final build.
更重要的是，在测试循环中出现的测试中，不再存在对最终构建质量上的观察的11 天的延迟。
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