to close by coming together (like the lips of a wound, the doors of an elevator, the walls of a channel)
to close by connecting in a loop (like a circuit)
closed-loop
Definitions (Wiktionary)
verb
to close; to shut; to close off; to turn off
adj
closed (forming a loop)
閉合電路
闭合电路
bì hé diàn lù closed circuit
Definitions (Kaifangcidian)
（沒有對應漢語詞彙）
Examples (Tatoeba—Mandarin-English)
Mandarin
因为有高而闭合的领子、紧身的剪裁和在笔直裙子两边的开口，旗袍有着独一无二传达端庄和性感的能力。
因為有高而閉合的領子、緊身的剪裁和在筆直裙子兩邊的開口，旗袍有着獨一無二傳達端莊和性感的能力。
yīn wèi yǒu gāo ér bì hé de lǐng zi 、 jǐn shēn de jiǎn cái hé zài bǐ zhí qún zi liǎng bian de kāi kǒu ， qí páo yǒu zhe dú yī wú èr chuán dá duān zhuāng hé xìng gǎn de néng lì 。
With a high, closed collar, figure-hugging cut, and large slits at either side of a straight skirt, the qipao is unique in its ability to communicate both modesty and sensuousness.