抗疟疾和对其他血液原虫有作用的药的有害效应 Adverse effects in therapeutic use, antimalarials and drugs acting on other blood protozoa
他呼吁美国在给该地区带来和平的问题上发挥更加有效的作用。
He called on the United States to play a more effective role in bringing peace to the region.
任何计时系统都是有效的，每一种系统都和它的作用一样值得称赞。
Any timekeeping system is valid, and each is as praiseworthy as its purpose.
八月：有效的SOA软件平台的作用。
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