(of difficulties, problems, etc. 困难、问题等 that cannot be dealt with successfully 无法克服的；难以解决的；不可逾越的 The age barrier appeared insurmountable. 年龄障碍看来是难以逾越的。 They were now faced with seemingly insurmountable technical problems. 他们现在面临着看似无法解决的技术难题。
Oxford Collocations Dictionaryverbs- appear
- be
- prove
- …
- almost
- nearly
- virtually
- …