1. The Sahara is a sandy desert with great sand hills. 撒哈拉沙漠是一个沙质沙漠,有很多沙丘。
2. Even before the drought, the Sahara was never well watered. 即使在变得干旱之前,撒哈拉沙漠也从未得到充分的灌溉。
3. Anyway, it's this fossilized pollen along with the aquifers and the rock paintings, these three things are all evidence that the Sahara was once much greener than it is today. 总之,这些花粉化石,还有含水层和岩画,这三样东西都证明了撒哈拉沙漠曾经比现在绿得多。
4. The Sahara slowly became drier and lakes vanished. 撒哈拉地区逐渐变得干燥,那里的湖泊也消失了。
5. How is that proof that the Sahara used to be a lot wetter? 这又怎么能证明撒哈拉沙漠曾经是湿润的呢?