21.?On scans, the climbers showed a reduction in both white matter and gray matter.

從掃描結果來看，登山隊員們大腦中所含的白質和灰質都降低了。

22. East Asian societies tend to be more socially complex than Western societies.

從社會學的角度看，東亞社會往往比西方社會更加復雜。

23. ecologically speaking 從生態(tài)學的角度來說

24. Its women weightlifters were?in contrast later starters.

泰國的女子舉重選手相對來說起步晚。

25. Truth be told. 說實話。

26. This can be said. 可以這么說。

27. It's safe to say that this is no easy feat. 可以肯定地說，這絕非易事。

28. I should say. 應該說…。

29. We could say…我們可以說……

30. What do you mean by saying this? 你說這話是什么意思?