public void removeBySpan(long startTime, long endTime) {
		int startIndex = this.getIndex(startTime);
		int endIndex = this.getIndex(endTime);
		for (int i = startIndex; i < endIndex; i++)
		{
			if (i < 0 || i >= nSlot)
				continue;
			this.aIsAvailable[i] = false;
		}
	}