a good three miles/ten years etcMORE THAN A NUMBER OR AMOUNTat least three miles, ten years etc, and probably more 至少三英里/十年等 It’s a good mile away. 至少有一英里的路。
He’s a good ten years younger than her. 他比她至少小十岁。
→ a good three miles/ten years etc at good1(4)