n. 需要, 必须, 缺乏 vt. 需要, 必需 vi. 贫困, 有必要 aux. 需要
At later stages in life we routinely work together to reach goals and help out in times of need.
四级 · CET-4 2026年6月 第1套
L) The message isn’t that everyone needs to run marathons in middle age, Knopman said, but a healthy lifestyle pays off.
四级 · CET-4 2026年6月 第2套
M) This type of study can’t say exactly what kind of exercise is best, or how much is needed—only a study that has a placebo (安慰剂) group and tracks people going forward can do that, said Keith Fargo, director of scientific programs and outreach at the non-profit Alzheimer’s Association.
四级 · CET-4 2026年6月 第2套
“The literature has not yet settled on an amount or type of exercise that is going to be key, although the bulk of literature has suggested that aerobic (有氧的) exercise is what you need to be doing,” he said.
四级 · CET-4 2026年6月 第2套
According to Knopman, the study gives the message that a healthy lifestyle is beneficial, but not that all the middle-aged need heavy exercise.
四级 · CET-4 2026年6月 第2套