tube; cylinder; to encase in sth cylindrical (such as hands in sleeves etc)

microphone; (telephone) receiver; handset; megaphone; (fig.) mouthpiece; spokesperson

bazooka; rocket launcher

flashlight

syringe

telephone receiver; headphone; earphone; earpiece; stethoscope

mailbox; postbox

bugle

a pump; water pump

circular cylinder; drum

sleeve; a tube for wrapping

barrel of a gun

inflator; bicycle pump

roller; cylinder (machine part); drum

chimney; stovepipe; smokestack

ice-cream cone

bamboo tube; bamboo pipe

pen container; brush pot

tube-shaped object; tube; bobbin; (Internet slang) homonym for 同志[tong2 zhi4]

fluorescent tube or light

a sleeve valve

tom-tom drum (drum kit component)

sleeve

trouser leg

mailbox; pillar box; (old) letter

graduated measuring cylinder; volumetric cylinder

traffic cone; road cone

kaleidoscope

loudhailer; megaphone; one who parrots sb; mouthpiece

(metaphorical) punching bag; undeserving target of sb's wrath

hair roller

Antlia (constellation)

trashcan

bicycle pump

paint roller

erhua variant of 袖筒[xiu4 tong3]

stockings; thigh-highs; CL:雙|双[shuang1]

tall boots

(Cantonese-influenced Mandarin) (coll.) traffic cone

tall boots

socket spanner

rotor sail

rice tube pudding, a single-serve column of glutinous rice topped with a sauce and garnished (Taiwanese dish, originally prepared by stuffing rice into bamboo tubes and steaming them)

binoculars

like beans pouring out of a bamboo tube (metaphor for blurting everything out at once)