British Antarctic Territory (an overseas territory in the Antarctic administered by the United Kingdom, and also including the South Orkney Islands and South Shetland Islands)

British Indian Ocean Territory (an archipelago and overseas territory of the United Kingdom in the Indian Ocean)

you should not interfere in a marital dispute

added after a placename to indicate where someone lives

thirty

twenty radical / two hands

learn

gun (firearm)

the number of overlaps; fold, layer

heavy water