D-usnic acid
[化] 右旋地衣酸
🧩 词语组成解析
🗣️ 情景例句
Are we scheduled to leave on time?
飞机准时起飞吗？
I usually go to bed at about midnight.
我通常在大约半夜睡觉。
for even though it was still summer, it rained continually and it was often bitterly cold.
因为即使那时仍为夏季，但雨总是下个不停，而且常常冷得厉害。