The weakness in the eight-character refers to your eight-character sun column, which is not supported by the moon, or even suppressed by the moon, and there is no corresponding seal to support it. In other words, no India gave birth to him. But smaller than the shoulder, without the same five elements of help or less help. And there are no roots in the branches.
For example, Jia Mu was born in Youyue, and there was only one Jia Mu in the sky, and no one drowned. Branches have no seawater and no shady trees. Then it can be said that this Japanese Lord is weak. This weakness means that the five elements of the sun column are not strong and rely less.