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There was a gradual decline in 2003.
2003年，出现了逐渐下降的情况。
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There was a gradual decline in 2008.
2008年，出现了逐渐下降的情况。
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There continues to be a gradual decline through the 50's.
从40岁到50岁，这些能力会继续逐渐下降。
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Around 1900 BC, signs of a gradual decline begin to emerge.
大约在公元前1900年左右，开始出现衰落的迹象。
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There has been a gradual decline in the population of the town.
该镇的人口一直在逐渐减少中。