Modified Beaver
1,620 वेळा पाहिले
व्हिडिओचे वर्णन
To clean the rivers and the canal we use our modified beaver : it collects both organic and synthetic materials. Dispersion is pollution, concentration accelerates bio-degradation. Animals are just amazing.
जोडलेले
13 जाने. 2017
टिप्पण्या
