科学家们认为很久以前在那个行星上可能有水存在。
Scientists think there was probably water on the planet long ago.
科学家们认为，在木卫二的海底可能存在这样的化学物质。
Scientists believe there might be such chemicals lying at the bottom of Europa's ocean.
科学家们认为在大气层下存在着一层由碳和氧组成的稀薄地壳。
Under the atmosphere, scientists think there is a very thin crust of carbon and oxygen.
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