It is therefore important that your code checks a return value is not an empty handle before continuing execution.

所以在继续执行前，在代码中检查返回值是否为一个空句柄是非常重要的。

youdao

PERL is the driving language it controls the build or deployment flow, checks return codes and based on the logic executes through a designed build and deployment path.

PERL是驱动语言，它控制构建或部署流，检查返回的代码，用设计好的构建和部署路径执行逻辑操作。

youdao

Also keep all cancelled checks and credit card receipts for all rental expenses deducted on your tax return.

同时，保管好作废的支票和纳税申报表要扣除的租金开支费用的信用卡记录。

youdao

Seventy women have been asked to return to hospital for checks because of concerns about the work of a consultant who was suspended, bosses say.

BBC: Tower Block at the Royal Cornwall Hospital

Those with a high result would return for frequent screening and checks (and treatment if necessary), while those with normal results could wait until their early 50s for their next PSA test.

BBC: Prostate cancer: Case to test men in their 40s

We are replacing the generator and running additional checks so as to return the aircraft to service.

FORBES: Can Boeing Contain the Dreamliner's Technical Glitches?