万难 | wàn nán | countless difficulties / extremely difficult / against all odds | |
高难 | gāo nán | extremely difficult / hard and dangerous / challenging | |
千难万难 | qiān nán wàn nán | extremely difficult | |
难上加难 | nán shàng jiā nán | extremely difficult / even more difficult | |
难上难 | nán shàng nán | extremely difficult / even more difficult |