int *leftArr = (int*)malloc(n1 * sizeof(int));
从8年攻坚、5年巩固，再到常态化精准帮扶、乡村全面振兴，时间刻下奋斗足迹。在“阶梯式递进、不断发展进步的历史过程”中，一程又一程跋涉，步履坚实。
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You can include multimodal data like images. There’s something strange about including images when going back to Roman times or 1700 because while they had texts, they didn’t have digital images. However, this is acceptable for some purposes. You’d want to avoid leaking information that could only be known in the present. You could include things people at the time could see and experience themselves. For example, there may be no anatomically accurate painting in Roman times of a bee or an egg cracking, but you can include such images because people could see such things, even if they weren’t part of their recorded media. You could also have pictures of buildings and artifacts that we still have from the past.
贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。