41-50组

41不可推卸的义务

an indispensable duty

42满足需求

satisfy/ meet the needs / requirements of...

43宝贵的自然资源

valuable natural resources

44方便快捷

convenient and efficient

45在人类生活的方方面面

in all aspects of human life

46社会进步的体现

a symbol of society progress

47科技的飞速更新

the accelerated updating of science technology

48有/提供如下理由/证据

have/ provide the following reasons/ evidence

49在一定程度上

to some extent/degree / in some way

50理论和实践相结合

integrate theory with practice / apply theory to practice