套筒

套筒	tào tǒng	sleeve / a tube for wrapping
套	tào	to cover / to encase / cover / sheath / to overlap / to interleave / to model after / to copy / formula / harness / loop of rope / (fig.) to fish for / to obtain slyly / classifier for sets, collections / bend (of a river or mountain range, in place names) / tau (Greek letter Ττ)
筒	tǒng	tube / cylinder / to encase in sth cylindrical (such as hands in sleeves etc)
筒	tǒng	variant of 筒