The overall net usability across multiple systems relative to their individual usability might surprise you.
跨多个系统的整体纯可用性跟各个系统各自的可用性比较的结果可能会让人吃惊。
There are sources of protein, and this may not surprise you are multiple, and they come in these various sources. These are all good sources of protein but not the only ones.
如你所知,依次为,鱼类和海鲜,家禽,肉类乳品,鸡蛋,豆类,酱油
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