Placcntal barrier
[医] 胎盘障壁
🧩 词语组成解析
🗣️ 情景例句
He's quiet now.
他现在很安静。
There's nothing to do because tomorrow is a holliday.
无所谓因为明天是假期。
Sometimes a tame elephant is tethered nearby to give the wild one confidence,
有时，把一头已驯服的象拴在旁边能给野象以信心。