它从一个女人慈爱的手开始，由另一个女人慈爱的手延续。
It started with the loving hands of one woman, and continued with the loving hands of another.
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。
The oceanic plate is made of denser and heavier rock, so it begins to sink down under the continental plate and into the mantle.
一旦你开始让巨石滚动，巨石就会产生动量，这是由其质量和速度决定的。
Once you have started the boulder rolling, it develops momentum, which is defined by its mass and velocity.
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