The NULL argument to spe_context_run would become a third argument to the main function on the spe; there's no need for it in this example.

spe_context_run的NULL参数会成为spe上main函数的第3个参数；因此在这个例子中不需要使用它。

youdao

However, the tests such tools come up with tend to be fairly trivial and basic stuff, like whether a method can handle being passed a null argument.

然而，这些工具生成的测试往往相当琐碎和基本，例如方法是否能够处理传递来的null参数。

youdao

Called ON null INPUT — Specifies that the procedure is to be called even if any or all argument values are null, which means that the procedure must be coded to test for null argument values.

CALLED ON null INPUT——指定将调用的过程，即使任何参数值或所有参数都为null，这意味着必须对过程进行编码，来测试那些null参数值。

youdao

You are right, the Milankovitch forcing argument is ONLY A NULL HYPOTHESIS. I hope I haven't argued anything more than that.

WSJ: Climate Emails: Science and Candor