The scientists in Bonn have solved this mystery: differences in ripeness are often invisible, but can be detected acoustically in the form of ethylene.
波恩的科学家已经解开了这个谜底：肉眼往往区分不出水果的成熟度，但通过水果释放出的乙烯，从声学角度探测，就能做到这一点。
The scientists in Bonn have solved this mystery: differences in ripeness are often invisible, but can be detected acoustically in the form of ethylene.
波恩的科学家已经解开了这个谜底：肉眼往往区分不出水果的成熟度，但通过水果释放出的乙烯，从声学角度探测，就能做到这一点。
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