He added the ultrasonic speakers are lowered into the seabed "a bit like a lobster pot".
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It's not yet clear why researchers decided to point Webb in its direction, but little is known about the nebula, including the mass of the star creating it. That matters because a more massive star could eventually explode as a supernova, while a smaller, sun-like star would keep shrugging off layers of material until only a dense core remains and cools over time.，更多细节参见WPS官方版本下载
Then we would probably also want to allow specifying a Member (but