从某些方面来看，安慰剂是理想的药物：他们通常没有副作用，而且基本上是免费的。
In certain ways, placebos are ideal drugs: they typically have no side effects and are essentially free.
此项研究，中途退出的比率很高，差不多有一半的参与者(59人)在研究完成之前离开，通常是因为副作用，或因为治疗对他们没有帮助。
The study had a high dropout rate, with almost half of the participants (59 people) leaving the study before it finished, often because of side effects or because the treatment wasn't helping them.
虽然如此，几个专家说他们会继续支持怀孕者摄入DHA，既然它是安全的而且显然没有副作用。
Nonetheless, several experts said they would continue to support taking DHA in pregnancy, especially since it is safe and apparently has few downsides.
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