1·The challenge is how to ensure food without increasing animal numbers and having an impact on fragile lands and our resource bases.
如何在不增加动物数量、不影响脆弱的土地和我们的资源基础的情况下确保食物供应，这是一项挑战。
2·Topics may include possession, gifts, bailments, concurrent ownership, and philosophic bases of property rights.
主题可能包括占有，礼物，委托，共同所有权，和财产权利的哲学基础。
3·The purpose of these principles is to cover all your bases before presenting your designs.
这些原则的目的，是在你提出设计方案之前，把各方面的基础都过一遍。
4·But most code bases are quite complex.
但是大多数代码基础相当复杂。
5·For instance, we could have them maintain existing code bases and extend them.
比如，我们要使他们维持现有代码的基础并对其进行扩展。