挤奶机

huó sāi shì jǐ nǎi jī

活塞式挤奶机

piston milking machine

dāng nǎi niú chī shí de shí hou yī tiáo jī xiè shǒu bì jiù huì jiāng nǎi niú yǔ jǐ nǎi jī lián jiē

当奶牛吃食的时候，一条机械手臂就会将奶牛与挤奶机连接。

As the cow eats, a robotic arm connects the cow to the milking machine.