《太平广记·卷四十一·神仙四十一》
大都这种药，经过十六个季节，已经成为中品，就能使人长生。
大都此药，经十六节，已为中品。便能使人长生。
Most of this medicine has become a middle-grade after sixteen seasons, which can make people live longer.
<s>[INST] Kindly elucidate the central themes in this passage in English: 大都此药，经十六节，已为中品。便能使人长生。 [/INST] Most of this medicine has become a middle-grade after sixteen seasons, which can make people live longer.</s>
Kindly elucidate the central themes in this passage in English: 大都此药，经十六节，已为中品。便能使人长生。
user
Most of this medicine has become a middle-grade after sixteen seasons, which can make people live longer.
assistant