Frank was carrying out fuel-system tests which necessitated turning the booster pumps off.弗兰克在做燃料系统测试，这一测试需要关掉升压泵。A prolonged drought had necessitated the introduction of water rationing.由于持续干旱，用水需要实行配给了。The word " neces...
The lad was wearing rubber-soled shoes.这个小伙子穿着橡胶底的鞋子。He was wearing a thick - soled boots and easily trod out the fire.他当时正穿着一双厚底靴子,因此就很容易地把火踩灭了.Get your shoes heeled and soled here.把你鞋子在这里换底加跟....