更好的方法是使清洁的、可再生的能源更便宜。
The better way is to make clean, renewable energies cheaper.
一个多世纪以来，设法使心脏细胞再生一直是医学要努力达到的目标。
Regenerating functioning heart cells has been a goal of medicine for more than a century.
一个多世纪以来，设法使心脏细胞再生一直是医学要努力达到的目标。
Regenerating functioning heart cells has been a goal of medicine for more than a century.
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