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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.，更多细节参见爱思助手
원유·공항 선뜻 내준 UAE…17년 이어진 ‘동행 외교’ 덕 봤다，这一点在体育直播中也有详细论述