✅ 同义词
🗣️ 情景例句
Hello.... Hello, Alexandra. How are you? ... Fine.
好……Alexandra。你好吗 ……很好。
An empty sack cannot stand upright.
空麻袋，立不直。
But instruments far more delicate than that were needed if any really serious advance was to be made.
但是，如果要取得真正重大的进展，需要有比这种装置精细得多的仪器。