So he modeled it on a soft soccer ball instead.

所以他仿造了一个软足球。

The saliva helps to make the food compact down into a soft, warm ball, called a " bolus" .

在唾液的帮助下，食物被压缩成柔软、温暖的小球，称为“食团”。

A demonstration showed that the device could identify the difference between a soft, squishy ball and a solid plastic one.

演示表明该设备可以识别出湿软的球和坚硬的塑料球之间的区别。

It's exactly the same as regular tennis, just with smaller rackets and slightly softer balls.

- 它与普通网球完全相同，只是球拍更小，球稍软。