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because it's associated with stone tools.因为他们擅于使用石制工具
associated with 与…相联系，与 ... 有关
I associated with him in business.
我过去和他合伙经商。
He was briefly associated with that organization.
他同那个组织有过短时间的联系。
and a smaller face that's tucked up under the skull.颅骨下方的脸 ，则变小了
tuck up掀起，折起，卷起
Please tuck up the chair and put it side.
请把椅子折起来放在一边。
Please help me tuck up my sleeves.
请帮我卷起袖子。
