使用新增保留字做为识别项容易导致混淆，应该避免。
Using new reserved words as identifiers can cause confusion and should be avoided.
图片可以更为容易地表达这些概念，而仅仅使用文字则可能导致混淆不清。
A picture can express these concepts more easily, while words alone cause confusion.
这往往造成非常混乱的情况，即是很容易导致两种不同角色及责任的混淆—代理和合同当事人。
This has often resulted in very confusing standard trading conditions where the two contradictory roles and kinds of responsibility-of the agent and of the principal-are set out.
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