Backstopping
支援（backstop的现在分词）
🗣️ 情景例句
What's the weather like in Japan this time of year?
现在日本的天气怎么样？
How do you like Texas so far?
这些天来，你觉得得萨斯州怎么样？
Because the equipment for adding sound to films had not yet been developed.
因为给电影配音的设备还没有研制出来。