この扉は

this door

→ 此の
phrase Rare #33,997
this door この扉 means “this door,” while は marks it as the topic of the sentence. The phrase is often followed by information about the door, such as how it opens or what it is made of.
JA: この扉は重いです。
EN: This door is heavy.

この扉は開けないで

Don't open this door, okay?

この扉はガラスでできています

This door is made of glass.

この扉は強化ガラスでできています

This door is made of reinforced glass.

この扉はどうやって開く

How do I open this door?

この扉は内側から施錠されている

This door is locked from the inside.