1. 基本原则；基本规律
    If something is done on a particular basis, it is done according to that method, system, or principle.

    e.g. We're going to be meeting there on a regular basis...
           我们将定期在那里会面。
    e.g. The tea is prepared on a rota basis by the lady members...
           女性成员轮流准备茶水。

2. （行事的）理由，根据
    If you say that you are acting on the basis of something, you are giving that as the reason for your action.

    e.g. McGregor must remain confined, on the basis of the medical reports we have received...
           根据我们收到的病历报告，麦格雷戈的行动仍然必须受到限制。
    e.g. On the basis that recognising the problem is halfway to a solution, Mulcahy's comments yesterday should be well received.
           鉴于认识到问题的存在就相当于把它解决了一半，马尔卡希昨天的那番话应该会受到欢迎。

3. 基础；起点
    The basis of something is its starting point or an important part of it from which it can be further developed.

    e.g. Both factions have broadly agreed that the UN plan is a possible basis for negotiation.
           双方大致同意联合国的计划可能成为谈判的基础。
    e.g. ...the subatomic particles that form the basis of nearly all matter on earth.
           构成地球上几乎所有物质的基础的亚原子粒子

4. 依据；根据
    The basis for something is a fact or argument that you can use to prove or justify it.

    e.g. ...Japan's attempt to secure the legal basis to send troops overseas...
           日本试图找到向海外派兵的法律依据
    e.g. This is a common fallacy which has no basis in fact.
           这是一个没有事实依据的常见谬误。