Helicopters fly in appalling weather to succour shipwrecked mariners.直升机在恶劣的天气条件下起飞前去援救遇难的船员。Mariners were also able to fix their latitude by using an instrument called astrolabe.海员们还可使用星盘这种仪器确定纬度。The ancient mariners tr...
Mariners were also able to fix their latitude by using an instrument called astrolabe.海员们还可使用星盘这种仪器确定纬度。Ideal are like the stars --- we never reach them , but like mariners , we chart our course by them.理想犹如天上的星星，我们犹如水手，...