应该是“核桃”吧？没听说过“合桃”
核桃: [ hé tao ]
(n) walnut
例句与用法:
1. 腰果和核桃都是坚果。
Cashew nuts and walnuts are both nuts.
2. 坚果种子生长在有硬壳的果实之内的种子，如花生、杏或核桃
A seed borne within a fruit having a hard shell, as in the peanut, almond, or walnut.
3. 那个核桃啪的一声裂开了。
The nut cracked open.
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