C1 being one only; single唯一的,单一的
C1 not shared with anyone else专用的,独享的
More examples
The company's sole concern is to ensure the safety of its employees.
In most of these cases, the woman is the sole earner in the family.
Letters whose sole purpose is to make a political point will not be published.
He was the sole survivor of the plane crash.
The sole British runner, White Knight, was unplaced.
plural soles the bottom part of the foot that touches the ground when you stand or walk, or the bottom part of a shoe that touches the ground, usually not including the heel脚底;鞋底
plural sole one of a number of flat, round fish that are eaten as food比目鱼,鲽鱼
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