Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
A、wiggle擺動(dòng)slowlyWhencarbonisaddedtoironintheproperproportions,theresultissteel.
Peoplewhodonotsleepenoughtendtobecomeirritable.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.
Incalculatingthedailycalorierequirementsforanindividual,variationsinbodysize,physicalactivity,andageshouldbetakenintoaccount.