S-r
abbr. learning stimulus-response learning 学习刺激—响应学习; send-receive 发射-接收
🗣️ 情景例句
and wrote to his wife Martha.
给他妻子Martha写信。
Rome was not built in a day.
罗马并非一日可建成；坚持必成。
The thieves' car was badly damaged and easy to recognize.
小偷的车损坏严重，很容易辨认。