There are a number of operations that you can register callback routines for and the value to indicate each operation begins with EM_ (the complete list is available in the API reference guide).

有许多可以为其注册回调例程的操作，这个参数值指出了每个以EM _开头的操作(完整列表可以从api参考指导中获得)。

youdao

Once approved, the equity joint venture shall register with the concerned department of the State Administration for Industry and Commerce, and start operation after receiving its business license.

合营企业经批准后，向国家工商行政管理主管部门登记，领取营业执照，开始营业。

youdao

Parties in the Wilmington area that wish to register wireless microphones for event venues during this period of limited operation must send a request to OET by e-mail in accordance with the instructions provided in the Public Notice.

ENGADGET: FCC approves first white space device and database for Wilmington, NC