将“三阴性乳腺癌（TNBC）是最难治疗的BC亚型，其侵袭性高、转移率高、易复发，对患者的生存构成了极大的威胁。”翻译为英文

Triple-negative breast cancer (TNBC) is the most difficult-to-treat subtype of BC, with high invasiveness, high metastasis rate, and easy recurrence, posing a great threat to the survival of patients.