名词
中文翻译：矛尖指示器
同义词：
['spear pointer', 'spear indicator']
例句：
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1.The spear pointer was used to indicate the direction of the arrow.
矛尖指示器用来指示箭的方向。
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2. The spear pointer helped him find his way back to the camp.
矛尖指示器帮助他找到返回营地的路。
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3. The spear pointer was a crucial tool in ancient warfare.
矛尖指示器在古代战争中是一个关键工具。