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一對情侶有時性格不一樣, 表面看來唔係好合得來,

It seems true that a couple does not mean to be together when there are characterological differences between them.

但正因為係一凹一凸, 反為先可以互補不足.

However, it could be an ideal situation for the couple because their characterological differences can compensate each other.

例如, 一個喜歡說話, 而另一個比較文靜,

For example, one of them does most of the talking while the other one prefers to remain quiet.

文靜的一位就正好可以做到最佳的聆聽者.

It is a perfect match as the quiet one would be a great listener.

事後俾意見多少有點馬後炮，characterological 係醫學同臨床心理學的專業用字，用於一般翻譯始終不大適合，其實 character differences 或 differences in character 已經可以了。