Whencarbonisaddedtoironintheproperproportions,theresultissteel.
A、containerIn 1861 it seemed inevitable that the Southern states would break away from the Union.
Insectpestsareamongtheleadingcausesofcropfailure.
Formulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.
Peoplewhodonotsleepenoughtendtobecomeirritable.
Some animals pant and sweat to speed evaporation of body moisture and thus cool themselves.
