Breakdown of kono doa ni wa kagi ga hitsuyou desu.
ですdesu
to be
はwa
topic particle
がga
subject particle
にni
at; on; in; to; for [indirect object particle]
このkono
this ... adnominal
ドアdoa
Western style door
必要hitsuyou
necessary; necessity
鍵kagi
key
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