Underdevelop
v. (使)发展不完全, (使)显影不足
🗣️ 情景例句
The baby-sitter called.
临时保姆打电话来了。
Your friend was here a week ago,wasn't he?
一个星期前，你的朋友曾在这里，是不是？
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。