The deepest known point on the Earth is at the bottom of the Mariana Trench, a depression in the floor of the western Pacific Ocean, southeast of Japan.是什么意思_The deepest known point on the Earth is at the bottom of the Mariana Trench, a depression in the floor of the western Pacific Ocean, southeast of Japan.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句