He had a profound knowledge of mantras and their efficacy.
他深谙各种咒语及其功用。
After buying medicine to come back each time, he should check their efficacy.
每次买完药回来，他都要检查他们的药效。
But there are still many questions about both their safety and their efficacy.
但人们对它的安全性和功效仍然有很多疑问。
But there are still many questions about both their safety and their efficacy.
但人们对它的安全性和功效仍然有很多疑问。
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