protection from dust

be useful, serve / be valid, be usable (e.g. a coupon at a cash register)

desert (barren area)

to have one's heart at ease, to feel easy, to be relieved

relief / lack of worry, peace of mind / (Buddhism) equanimity

unworrying, safe

camera / video camera / movie camera / surveillance camera

function (as something), work

a function

attach itself to, stick, stick to, adhere, adhere to; be connected with / come in contact with, touch, reach / be attached to, belong to, join, associate with; take up the cause of