If there is no cycle, return null.

如果没有环，则返回空。

youdao

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。

youdao

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。

youdao

Unlike auto rickshaws, which burn fuel, cycle rickshaws produce no pollution.

VOA: special.2009.05.11

Without fractional reserve banking, without the Fed, and with sound money there would absolutely be no business cycle.

FORBES: Fighting the Last Monetary War

The march of technology waits for no business cycle.

FORBES: Magazine Article

When you fall back into those tired cliches, you put us back in the cycle where no progress happens.

CNN: On gun control, two places to start