Plus, it alleviates the burden of shipping blood all over the world.
另外，这种技术大大降低了全球各地运送血液的负担。
Over time, these things have become a heavy burden.
日积月累，这些事都成为了沉重的负担。
We went over hills and rivers with the heavy burden on the shoulders.
我们扛着那沉重的柴禾翻山过河。
We went over hills and rivers with the heavy burden on the shoulders.
我们扛着那沉重的柴禾翻山过河。
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