Line 03 checks to see if the parameter value is null (or nil, as Ruby calls it).

第03行检查参数值是否为null(在Ruby调用时为nil)。

youdao

Tell crew the person's position in the water, or telephone the bridge immediately, the number is 03.

告诉船员落水人的位置或立即用电话报告驾驶台，电话号码是03。

youdao

That is 21.35, plus or minus.03.

是21。35，加减0。

youdao