all; entire; whole; altogether
harmful gas; toxic gas; noxious gas
selection; sorting; culling; screening; triage
outside (the room, building); outdoors
discharge; evacuation; emission (e.g. of CO2); ejection; excretion
hurdle; hurdle race; hurdles; hurdle; obstacle
errand; mission; messenger; bearer; familiar spirit
simple; simplified; easy; plain
gas mask; (air-purifying) respirator
traditional; customary; conventional
protection against dust; dust-proof; dust-tight
high-functioning; high-performance; sophisticated
to attach; to stick together; to place together; to put side by side; to make (someone) get married; to get (someone) hitched
noxious gas; poisonous gas; toxic fumes
to be in danger of; to be liable to; to be at risk of
to withdraw from (a deal); to wash one's hands of; to lead by the hand
excess or deficiency; too much or too little
calamity; disaster; misfortune
rearing; training; nurture; cultivation; promotion
to wound; to injure; to hurt someone's feelings (pride, etc.); to damage; to chip
compulsion; coercion; forcing (to do); enforcement
ventilator; ventilating device
taking refuge; finding shelter; evacuation; escape; seeking safe haven
to stop (moving); to come to a stop; to stop (doing, working, being supplied); to come to a halt; to alight; to perch on
two legs; two feet; two pairs
physical work; manual labour (labor)
limitation; restriction; condition; constraints
precise; exact; detailed; accurate; minute; close
simple substance (e.g. chemical); something standing alone; separate item; solo item
labor; labour; manpower; working force