This is why, even when his absence is painful, there is a certain amount of pleasure even in mourning and lamentation;

正因如此，虽然爱人不在是痛苦的，但是甚至在悲恸和哀伤中也有一点快乐的成分；

youdao

Whatever crying, grieving, lamenting, weeping, wailing, lamentation of anyone suffering from misfortune, touched by a painful thing, that is called lamentation.

任何的哭泣、悲叹、在哀悼、流泪、哭号、哀悼任何人来自于不幸的痛苦、感触到一种痛苦，这就叫做哀悼。

youdao