Virtual essence, virtual
It's an adjective
These two words have the same suffix. The actual phonetic symbol t∫ pinyin reads ch.
E write backwards with phonetic symbols; The e in pinyin.
L finally pronounce ou in pinyin, but this sound is weak.
A in ac reads Pinyin, A in ai, C in Pinyin and K in Pinyin.
V reads w in pinyin, and ir reads e in pinyin.
It is ok to put it together as a whole.