梦寐以求 mèngmèiyǐqiú
[long-cherished;crave sth.so that one even dreams about it;dream wistfully] 在睡觉做梦时都在寻求,形容心情迫切,强烈追求
这一切,也正是鲁迅所梦寐以求并终生为之奋斗的!