1. Nervous types also worry whether Apple can keep up its staggering growth rate, especially with a current revenue base of $ 100bn.
忧心之众仍然担心苹果能否保持其惊人的增长速度，特别是在目前收入基础高达1000亿美元的情况下。
2. One's heart is torn with anxiety.; be burning with anxiety; nervous with worry
成语心里急得像着了火一样。形容心情极其焦急。焚：烧。