Optical transition
[化] 光跃迁
🧩 词语组成解析
🗣️ 情景例句
These items shouldn't be difficult to come by
这些东西应该是不难弄到的，
Nothing is impossible (or difficult) to the man who will try.
天下无难事，只怕不努力。
Looking at his watch, he saw that it was one o'clock, but the bell struck thirteen times before it stopped.
他一看表，才1点钟，可是那钟一边敲了13下才停。