翻译：假如再来一次大雪，。。。。

it it came another big snow storm...

假如再来一次大雪，。。。。
必须用虚拟语气:If it snowed heavily again next year,。。。

If it snows again,

if it were to snow again next year,...

翻译：假如再来一次大雪，。。。。

If there would snow heavily again,……

个人认为还是用would比较好，如果直接用will就体现不出题目上的“假设”二字了。