second-string
柯林斯词典
1. N-SING If you describe a person or thing as someone's second string, you mean that they are only used if another person or thing is not available. 替补[oft N n]
...a second string team. ...一支替补队。
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1. N-SING If you describe a person or thing as someone's second string, you mean that they are only used if another person or thing is not available. 替补[oft N n]
...a second string team. ...一支替补队。