(used after an adverb such as 不, 大, 稍 etc, and before a disyllabic verb, to indicate that the action of the verb is applied to sth or sb previously mentioned)
to apply (restrictions etc) to (sb)
to give (support, consideration etc) to (sth)
to increase
to augment
to append
門鐘
mun4 zung1
(noun) a door bell
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See how to write "閉路電視" with stroke-by-stroke animation