EJB 2.0 solved this problem by adding an optional local interface, as seen in Listing 3.

EJB 2.0通过添加一个可选的本地接口解决此问题，如清单3所示。

youdao

The message part name is mandatory for interface typed variables, and optional for data typed variables.

消息部分的名称对于接口类型的变量是必需的，对于数据类型的变量是可选的。

youdao

Here, though, we assume the messaging provider is WebSphere MQ and that applications will access it through its optional JMS interface.

不过，这里我们假设消息提供程序是WebSphere MQ，并且该应用程序将通过其可选JMS接口访问它。

youdao

It runs Jelly Bean with an optional interface that mimics a feature phone's home screen.

ENGADGET

Mustang will be the first vehicle that will offer AppLink with the standard SYNC interface, as well as be integrated into the optional Voice-Activated Navigation System, providing the additional convenience of an 8-inch touch screen for control.

ENGADGET: Ford SYNC AppLink hands-on in a little green Fiesta

Both models include 270-degree swivel 921k-dot touch-enabled TruBlack LCDs and XGA OLED eye-level electronic viewfinders, along with Sony's new Multi Interface Shoe, which enables XLR microphone inputs through an optional accessory.

ENGADGET: Sony announces NEX-VG30 and full-frame NEX-VG900 Handycams, we go hands-on