问题补充：
The Diaoyu islands have been part of chinas territory since ...The Diaoyu islands have been part of chinas territory since ancient times,serving as important fishing grounds of Taiwan.为什么是主动的不是表目的的,
答案：
【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
