Coffee production also stagnated, because farmers had little incentive to replace old trees . 由于农民得不到什么鼓励去更新老树，咖啡生产也停滞了。
At the galapagos rift, volcanic activity beneath two geologic plates renews the earth's crust . 在加拉帕戈斯裂谷，两地质板块下面的火山活动使地壳更新。
Adipose tissue is in a state of continuous turnover and is sensitive to nerves and hormonal stimuli . 脂肪组织在不断地更新，对于神经和激素的刺激很敏感。
If changes are made to the tunnel after it has been built, it may be necessary to make a fan revision . 在风洞建成以后，如果要进行修改，那么风扇也可能要更新。
New systems must maximize the role of ecological mechanisms and emphasize the use of renewable resources . 新的系统应发挥生态机制的作用并重视可更新资源的利用。
It may be obsolete after only two years because a new and more efficient machine has been invented . 这可能会因为发明出了更新更有效率的机器而在仅仅使用两年后就被废弃。
Land and other resources should not constrain the development of biomass as a renewable energy source for the future . 土地和其它资源应该不妨碍作为未来可更新能源的生物量的发展。
Physics is an ever-changing adventure with interest first in one direction and then another . 物理学是一个永远在更新着的探险事业，它先是在这个方面，接着又在另一个方面吸引着人们。
Young people had to learn to renew and preserve nature's resources, so that they might live on the land for generations . 年轻人不得不学习更新和保护自然资源，以便在这块土地上世代生活下去。
Even making allowances for the costs involved in urban renewal, it is still rather surprising that so little has taken place . 既使考虑到城市更新存在着这些代价问题，这方面的工作进展如此之缓慢，还是出人意料的。
