The problem is that so far, we have never actually cleared the entire line: we've always just written the new characters over the old characters, assuming that the string of new characters would be longer and over-write them. This is no longer true once we can delete characters.
从全球监管动态观察，各国对电子烟的管控呈现“日益严格、标准各异”的趋势。
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Службы экстренного реагирования оперативно прибыли на место и эвакуировали обоих летчиков. Состояние пилотов не вызывает опасений.
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