Ulcers
n. 溃疡, 疡（ulcer的复数）
🗣️ 情景例句
Please do the work at your own convenience.
请在方便时把这事做一做。
If the sky fll (or falls), we shall catch larks.
异想天开
The timing is very important, not only for the movements but also for the lines of the dialogue.
剧中动作以及对 话中台词的时间安排非常重要。