Translation of "Unknown" in Chinese

Fear comes from the unknown.

恐惧来源于未知。

Tom is an unknown artist.

Tom是個不知名的藝術家。

The cause of death is unknown.

死因不明。

The cause of the fire was unknown.

火災的原因不明。

- The cause of the fire is not known.
- The source of the fire is unknown.
- The cause of the fire is unknown.

起火原因不明。

When I opened my eyes again, all of a sudden an unknown lady was standing right in front of me.

當我再次睜開眼睛, 突然有一個陌生的女人站在我面前。

- The cause of the fire is not known.
- The origin of the fire is unknown.
- The cause of the fire isn't known.

起火原因不明。

The vast majority of high school students I know can't read an unknown word and pronounce the letters in the right order, let alone pronounce it correctly or naturally.

絕大多數我所認識的高中學生，無法讀一個他們不認識的字和以正確的順序來發音字母，更不用說正確或自然地發音了。