massive hydrocarbon reservoir

例句：

1. 1.The construction of the new bridge was a massive undertaking.
   建造这座新桥是一项巨大的工程。
2. 2. The discovery of this rare species is a massive breakthrough in our understanding of nature.
   这一稀有物种的发现是我们对自然界理解的重大突破。
3. 3. The team's performance was massively improved after the coach's guidance.
   在教练的指导下，队伍的表现得到了显著提升。