Grapes are small green or dark purple fruit which grow in bunches. Grapes can be eaten raw, used for making wine, or dried.
PHRASE
酸葡萄心理（指因得不到想要的东西便说它一文不值）
If you describe some-one's attitude as sour grapes, you mean that they say something is worthless or undesirable because they want it themselves but cannot have it.
例句
These accusations have been going on for some time now, but it is just sour grapes.这些指责到现在已经持续了一段时间，但这不过是吃不到葡萄说葡萄酸罢了。