人们获得足够的食物，充分享受生活在城市中的安全和舒适当然是一件好事——但这确实会带来环境代价。
Getting enough to eat and enjoying the safety and comfort of living fully on the grid is certainly a good thing—but it does carry an environmental price.
但直到十年前这些个模式对以一种充分互补的方式解决这些问题才足够的完备。
But it wasn't until about 10 years ago that the models became comprehensive enough to tackle these questions in a fully coupled way.
只要母亲摄入足够的B12，母乳即是婴儿b 12充分的来源。
Breast milk is an adequate source for infants only if the mother's intake is adequate.
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