Correct

筒形

/ tǒng xíng / 
Strokes

Example

As an Adjective

tube-type; barrel-type; cylindrical

1
Tǒngxíng
筒形
yāsuōjī
压缩机

barrel-type compressor

2
Tǒngxíng
筒形
guōlú
锅炉

barrel/cylindrical boiler

3
Tǒngxíng
筒形
chǐlún
齿轮

tube gear