However there are still many unknowns surrounding the safety and effectiveness of that strategy.
然而，关于此道的安全性与有效性仍有许多未知数。
However, there are still many unknowns surrounding the safety and effectiveness of that strategy.
然而，关于此道的安全性与有效性仍有许多未知数。
The researchers said both the safety and the effectiveness of the method was unclear.
研究人员表示该方法的安全性、有效性尚不明确。
The second category means those medical instruments whose safety and effectiveness shall be controlled.
第二类是指，对其安全性、有效性应当加以控制的医疗器械。
Objective: To observe clinical effectiveness and safety of cedilanid in treatment of cardiac failure.
目的：观察地兰治疗心力衰竭的临床观有效性及安全性。
Lt features safety, high effectiveness and low toxicity.
具有安全、高效、低毒的优点。
Lt features safety, high effectiveness and low toxicity.
具有安全、高效、低毒的优点。
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