1. This is the oldest Hebrew manuscript in existence. 这是现存最古老的希伯来语手稿。
2. Today we're gonna review the overall reactor types that are presently in existence. 今天我们要回顾一下现有的反应堆类型。
3. It assures that the astronomical cycles have been in existence for billions of years. 这使人们确信天文周期已经存在了数十亿年。
4. All Y chromosomes in existence today are descended from a single ancestor's who is thought to have lived about 140,000 years ago. 现在存在的所有 Y 染色体都来自于一个被认为生活在大约14万年前的同一祖先。
5. These damaging frosts wouldn't happen if the wetlands were still in existence, just a tiny temperature difference can have major consequences. 如果湿地还存在的话，就不会发生这些破坏性的霜冻，正如仅一点微小的温差就会产生重大的后果一样。
