Nullcheck
空检查
🗣️ 情景例句
Can I call you sometime?
我能给你打电话吗？
What's your favorite pastime?
你最喜欢的消遣是什么？
It's Tree Planting Day. We're going to plant trees in the park along the lake.
明天是植树节。我们要去公园/沿着湖边种树。