School Workshop with Cambridge Primary School at Tsinghua: How to build a mini-biosand filter

School Workshop with Cambridge Primary School at Tsinghua: How to build a mini-biosand filter.

剑桥小学来清华大学参加“如何建造生物慢滤池”活动。

1545670590 1905476428 2106404788

Leave a Reply

Your email address will not be published. Required fields are marked *