Closed under union
[计] 对\或\运算封闭
🧩 词语组成解析
closed
[klozd]
adj. 关闭着的，封闭着的;密闭着的，保密的;<美>准备好了的，定了契约的;
v. “close”的过去式和过去分词;
clos=close关闭+ed已...的→关闭了的
under
['ʌndɚ]
prep. 在…下面，在表面之下;在…的假定表面或掩饰下;少于，小于;在…情况下;
adv. 在下面;少于;在水下;在昏迷中;
adj. 较低的，下面的;
🗣️ 情景例句
and becoming part of the Stewart family, too.
而且成为Stewart家庭的一份子。
No. You should have taken the Yellow Line bus. You can get one at the next stop.
不是。你该乘黄线车才是。到下一站你可以搭上。
Waves are the children of the struggle between ocean and atmosphere.
海浪是大海和空气相斗的产物。