Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.

石油和天然气的密度都比水小，所以二者通常会浮在被水浸泡的岩石和沉积物的表层。

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The oceanic plate is made of denser and heavier rock, so it begins to sink down under the continental plate and into the mantle.

海洋板块是由密度更大、更重的岩石构成的，所以它开始下沉到大陆板块之下，到地幔之中。

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"So,I'm also now a wilderness EMT so it's totally a good thing to have when you're out rock climbing."

VOA: special.2009.12.09

So because so much popular music and particularly rock music has those chords in root position we can track them more readily.

因为很多流行音乐尤其是摇滚乐会在原位上添加这样的和弦,这样听起来会比较悦耳。

耶鲁公开课 - 聆听音乐课程节选

Why are you so passionate about rock climbing even though it's dangerous?

为什么攀岩那么危险你还喜欢呢？

攀岩的刺激 - SpeakingMax英语口语达人

Such blue-chip financial institutions rely largely on 20 or so rock-star sharia scholars to certify that their financial products are in accord with the Koran and the Prophet's teachings.

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' So the rock 'n' roll edge, having a rock guitar, was kind of the icebreaker to say we're familiar.

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"Our whole thing is so 'rock': we do crossword puzzles, " she says.

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