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We now maintain an index variable. Previously, the cursor was always at the right-end of the input, since you couldn't use arrow keys to move it left, and new input was always appended at the right-end. Now, we need to keep a separate index which is not necessarily at the end of the input, and when a user enters a character we splice it into the input in the correct location.
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如果说过去十年，CAR-T疗法是肿瘤学领域的一场“神迹”，那么现在，这场神迹正跨越边界，向另一片广阔的领域蔓延——
Фото: Гавриил Григоров / POOL / РИА Новости
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第八条 居民委员会由主任、副主任和委员共五至九人组成。
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