我们在水产养殖中做出的每一个决定都必须平衡经济可行性和生态敏感性。
可持续性必须是现代采石场运营的基石,而非事后考虑。
Mrs. March knew that experience was an excellent teacher, and when it was possible she left her children to learn alone the lessons which she would gladly have made easier, if they had not objected to taking advice as much as they did salts and senna.