服务规范仅定义外部特征，以维持服务使用者与服务提供者之间的关注事项分离。
The service specification defines only external characteristics to maintain separation of concerns between the service consumer and service provider.
鼠标是一个必要的外部设备，它可以使用户以比仅使用键盘快得多的速度完成许多操作。
A mouse is essentially a pointing device that allows the user to do many operations more quickly than he could with the keyboard alone.
不要重复使用面膜。一片只使用一次。破损或过敏肌肤勿使用。外部仅使用一次。远离儿童。
Do not re use mask. one use only. do not use on broken or irritated skin. for external use only. keep out of the reach of children.
不要重复使用面膜。一片只使用一次。破损或过敏肌肤勿使用。外部仅使用一次。远离儿童。
Do not re use mask. one use only. do not use on broken or irritated skin. for external use only. keep out of the reach of children.
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