Insectpestsareamongtheleadingcausesofcropfailure.
A、expectedWhencarbonisaddedtoironintheproperproportions,theresultissteel.
Some sea urchins海胆 have venomous (toxin) spines
Food must be moist in order to have a taste.
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
Cream of tartar 酒石 , a weak acid, can be added to egg whites to help them foam泡沫 when they are beaten
