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2013-05-23 12:21
求翻译：Oil is hard to find, because it is trapped deep under the earth. Once the only way people knew there was oil someplace if it leaked out of the ground. Today, however, we have many ways of finding oil. One tool measures the pull of gravity. From this passage, we can know oil is _______________.是什么意思？ 待解决
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Oil is hard to find, because it is trapped deep under the earth. Once the only way people knew there was oil someplace if it leaked out of the ground. Today, however, we have many ways of finding oil. One tool measures the pull of gravity. From this passage, we can know oil is _______________.
问题补充： |
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