The Diaoyu islands have been part of china's territory since ...The Diaoyu islands have been part of china's territory since ancient times,serving as important fishing grounds of Taiwan.为什么是主动的不是表目的的,
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【钓】【鱼】【岛】自古以来就是中国领土的一部分,是台湾重要的渔区（即捕鱼的地方）.
不是所有的主动都表目的,此处仅仅是陈述客观事实