僵化: to become rigid...
大使: ambassador, envoy...
夏季: summer...
材料: material, data, makings, stuff...
耐性: patience, endurance...
感兴趣: to be interested...
均衡: equal, balanced, harmony, equilibrium...
逞强: to show off, to try to be brave...
估计: to estimate, to reckon, (coll.) to suppose...
蹲: to crouch, to squat, to stay (somewhere)...