Sustainable practices are not just an option; they are a necessity for the survival of our industry.
可持续的做法不仅是一种选择，更是我们行业生存的必要条件。
从n对观测值的样本中获得的相关系数的可能误差是sqrt((1-r²)/(n-2))。
遗忘就是自由。
You are too generous to trifle with me. If your feelings are still what they were last April, tell me so at once. My affections and wishes are unchanged, but one word from you will silence me on this subject forever.