诉求的表达很繁复，也很多样。这就需要大人时刻准备着，说对了要表扬，说错了要纠正。
「十年前我每兩年換一次手機，有時一年一換；也能輕鬆買新進口車。現在連升級到稍好一點的二手車都很吃力，更別說新車。」
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if (n <= 1) return;
The Web streams spec requires promise creation at numerous points — often in hot paths and often invisible to users. Each read() call doesn't just return a promise; internally, the implementation creates additional promises for queue management, pull() coordination, and backpressure signaling.