例句與造句

1. At ancient times , people were navigated by means of sun , fixed stars , etc . , while currently the common navigation systems are astronomic navigation , inertial navigation and radio navigation
   以前，人們主要利用太陽、星星等自然天體?，F(xiàn)在人們利用的導(dǎo)航系統(tǒng)主要有：天文導(dǎo)航系統(tǒng)、慣性導(dǎo)航系統(tǒng)、無線電導(dǎo)航系統(tǒng)三大類。
2. It's difficult to find common navigation system in a sentence. 用common navigation system造句挺難的