HIV, being a tough adversary, there will undoubtedly be more setbacks in the future but with increasing commitment and perseverance, a safe and reliable vaccine will ultimately be found.
艾滋病毒是一个强劲的对手，毫无疑问，将来还会有更多的挫折，但只要作出更多的承诺，更加坚定不移，就将最终找到一种安全和可靠的疫苗。