knock down击倒;撞倒;击落;使屈服

2.Health officials say a delay in vaccine production comes down to a 50-year-old technology that relies on eggs.

come down to归结为,简化为

例句：I am terrible when it comes down to organizing my thing.
      为什么我的料理能力这么差劲。

      Political decisions sometimes come down to the judgement and wisdom of individuals.
      政治决策有时候可归结为个人的判断和睿智。

rely on依赖,依靠

例句：The most successful social change campaigns don't just rely on social media alone.
      最成功的社会变革运动不能只依靠社会性媒体来进行。
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