布朗也会从他对国家保险的变化中受益，他使收入水平和收入税系统一起受限于国家保险。
Mr Brown will also gain from changes he is making to national insurance, aligning the income levels subject to it with those in the income-tax system.
此外，气候年复一年，甚至十年又十年的自然变化与人为的气候变化混合在一起，使我们更难找准其危害行为。
Moreover, year-to-year and even decade-to-decade natural variations in climate are intermixed with human-induced climate change, making it even more difficult to target damaging behaviour.
黑尔说，基因常常是组合起来才起作用。有望某天新基因会和其他基因关联在一起，使湖鲟产生适应所处环境变化所需的新性状。
Hale said genes often work in combination, and new genes may one day become involved with other genes to help the lake sturgeon create new traits needed to adapt to changes in its environment.
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