people on lower incomes spend a disproportionate amount of their income on fuel

低收入的人花在燃料上的钱却不少

persistent offenders were given sentences that were disproportionate to the offences they had committed.

惯犯在被判刑时是从重量刑的。

water disproportionates to oxygen and hydrogen.

水歧化成氧气和氢气。