Before 1980, no trend could be seen, but after 1980, the annual runoff coefficient tended to decrease.

年径流系数的变化和年径流量的变化相似，1980年以前无趋势性变化，1980年后有减小的趋势。

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The trend toward uniform statutes has tended to decrease these conflicts, but many of them still exist.

统一法规的趋势已趋于减少这些冲突，但很多冲突仍然存在。

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They also found that when people spent more time looking at the natural scene their heart rates tended to decrease more.

此外，研究人员发现，人们看自然风景的时间越久，心率下降得就越多；

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The authors found that high top marginal income tax rates tended to decrease the share of entrepreneurship in a state.

FORBES: Don't Let The Pundits Fool You, A Tax Hike On The Rich Is Paid For By The Poor

And as science has discovered more about the workings of the climate, estimates of how much the earth will warm have tended to decrease.

ECONOMIST: If you want a cool planet, keep a cool head