P.-p. substance
[医] 糙皮病预防物质
🧩 词语组成解析
🗣️ 情景例句
We have already conceded, it's in your hands now.
我已经做出让步，现在决定权在你手中。
To ride a bicycle
骑自行车
These are partly a matter of personal circumstances, partly a matter of psychology.
这里一方面是个人所处的环境，另一方面是个心理学的问题。