它们吃起来很美味用英语怎么说

"They taste delicious."
This is a simple way to express that something tastes good in English.
Source: This is a common phrase used in English to express that something tastes good.
Example sentences:
"These cookies taste delicious."
"The meal was delicious, I enjoyed every bite."
Translations:
这些饼干味道很美味。
这顿饭味道很美味，我每一口都很享受。