So the = 1 tests that the result of this union only contains one element, meaning that the currently-tested element is the first one in the document with its address.

因此，用来测试并集结果的 = 1 表达式只包括一个元素，这意味着当前测试的元素是包含地址的文档中的第一个元素。

youdao

The European Union pushed forward with a controversial plan to rejig bankers’ bonuses that would reduce the amount payable in cash and increase the element of shares in bonus schemes.

欧盟出台了一项颇具争议的方案，要求对银行家们的奖金制度进行调整，减少现金支付，增加证券支付比例。

youdao

Everybody should be clear for one element: in this world, there is one set of complete and rigorous organized financial system exist, that is world Union Funds.

大家必须明白一点的是，在这个世界上，是有一套完整和组织严密的金融体系存在的，它就是- - -世界联合基金会！

youdao

And this will have to go up before The International Union of Pure and Applied Chemistry before they approve it because they fought over element 106 for the longest time, but I think this will go through fairly quickly.

但还是要往上申请,直到国际纯粹与应用化学联合会,因为同意,他们为106号元素抗争了很久，但我想这个应该会很快通过。

麻省理工公开课 - 固态化学导论课程节选

Thatcher formed with both Soviet leader Mikhail Gorbachev and Mr. Reagan, and her vocal support of the uncompromising U.S. position toward the Soviet Union, proved an important element in the end of the Cold War.

WSJ: Former British Prime Minister Margaret Thatcher Dies

We worked hard on that new policy element of trying to turn the Soviet Union inside itself.

CENTERFORSECURITYPOLICY: Center for Security Policy | Symposium on the fall of the Berlin Wall: Reassessing the causes and consequences of the end of the Cold War

"It is clear that the main element of any United States policy toward the Soviet Union must be that of a long-term, patient but firm and vigilant containment of Russian expansive tendencies, " he wrote.

BBC: NEWS | Americas | American Cold War architect dies