optional features短语³³⁴¹² 基本例句 选定的特性 The Graph has many optional features you can toggle on or off, including zooming, dynamically setting the maximum and individual units, and more. 图形有许多选项，你可以缩放、动态设置最大值和单个的单位，等等。 iciba Lockable doors, desktop power, data ports, and a scalable power supply are optional features. 任选项包括可锁门，台式电源，数据端口，和可扩展电源。 www.21csp.com.cn