It's been dry for so long that the forest could burst into flame at any moment.
翻译:
干旱持续了这么久，森林随时可能起火。
知识点解析:
结果状语从句 + 固定搭配。so… that… 引导结果状语从句；burst into flame(s) 是固定短语，意为“突然起火、燃烧”。