energy ~ ability of causing change
energy used ~ amount of change
— Me@2014-08-19 02:44:22 AM
2014.08.21 Thursday (c) All rights reserved by ACHK
energy ~ ability of causing change
energy used ~ amount of change
— Me@2014-08-19 02:44:22 AM
2014.08.21 Thursday (c) All rights reserved by ACHK