The boundless sea of suffering; an endless abyss of misery and hardship.
他的一生饱经磨难，感觉自己如同在苦海茫茫中挣扎，难以找到出路。
His life was full of tribulations, making him feel as if he was struggling in a boundless sea of suffering, unable to find a way out.
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The boundless sea of suffering; an endless abyss of misery and hardship.