病毒可能仍然在很底层在没有任何症状的人群中传播着，虽然目前还没有发现这样的病例。
The virus may still be spreading at very low levels among people who have virtually no symptoms, although such cases have yet to be found.
据一个近期的研究，脑干与很底层的声音编码有关，更多地暴露于音乐有助于调理这一系统，即便是对没有特殊音乐天赋的儿童也是如此。
According to a recent study, the brain stem is involved in very basic encoding of sound, and lots of exposure to music can help fine-tune this system, even in kids without particular musical gifts.
“身居高位很辛苦，”他说。“在底层更辛苦，”亿万富翁机敏地答道。
"It's tough at the top," he said. "It's tougher at the bottom," riposted the billionaire.
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