Beetles of that era came in two body styles — hard-top and cabriolet — and with one powertrain option: air-cooled, rear-engine, three-speed manual transmission.

那个时代的甲壳虫有硬顶式和敞篷式两种车身造型，不过动力系统却没得选，只有一款风冷后驱发动机，搭配三速手动变速箱。

youdao

Algorithms currently used for high speed data transmission over voice-band channels can be based on following three principles: on LMS criterion, on ls criterion or on artificial neural network.

高速数据传输中信道均衡算法大致分为三类：即基于LMS准则、LS准则和人工神经网络的自适应算法。

youdao

Mechanical travel drive of side transmission, hydraulic vibration and steering with three-gears travel speed for convenient transport between construction sites.

齿轮侧传动行走，液压振动，液压转向，三挡速度，转场方便；

youdao