反义词是bend，意思是弯曲，例如：
1.The supports under the bridge were starting to bend.桥下的支柱开始弯曲。
2.Bend your knees, keeping your back straight.膝盖弯曲，背部挺直。
3.I had to bend double to get under the table.我必须弓着身子才能钻到桌子底下。
反义词是bend，意思是弯曲，例如：
1.The supports under the bridge were starting to bend.桥下的支柱开始弯曲。
2.Bend your knees, keeping your back straight.膝盖弯曲，背部挺直。
3.I had to bend double to get under the table.我必须弓着身子才能钻到桌子底下。
