| 单词 | 攻法 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔switch over〕He's a professional man who started out in law, but switched over to medicine.他最初专攻法律, 但是后来转而从医。外研社新世纪I specialised in French linguistics at university.我读大学时专攻法语语言学。剑桥国际 |
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