Subunits
n. [计] 子单位；二级单位（subunit的复数）
🗣️ 情景例句
She is making steady progress in her learning.
她在学习中不断进步。
How's your daughter?
你的儿子好吗？
and if a single curved glass would distort nature, how much more would a pair of them?
何况一片曲面镜就可歪曲自然，那么伽利略的两片曲面镜对自然的歪曲又该多大呢？