58. Why do we need calendars？
Most of us need calendars to help us remember all the things we plan in a year. But they also help us keep track of time. When people are shipwrecked or taken hostage, they find unusual ways to mark the passing days.
1. keep track of：記錄
2. shipwreck：使遭遇海難後幸存
3. hostage：人質
3小知識日曆又分為陰曆、陽曆和陰陽合曆。
陽曆亦即太陽曆，其曆年為一個回歸年，現時國際通用的公曆（格裡高利曆）即為太陽曆的一種；
陰曆亦稱月亮曆，或稱太陰曆，其曆月是一個朔望月，曆年為12個朔望月，其大月30天，小月29天，伊斯蘭曆即為陰曆的一種；
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