if we take short breaks__.19. Food in small pieces could be eaten easily from the sun twigs which_ turned into chopsticks.20. Walls make of adobe take in the heat from the sun on hot days and give out that heat_ during cool nights， thus warning the house.21. …
今天是六一国际儿童节（International Children’s Day）。在很多法律和国际公约中，“儿童”的定义是指年龄小于18周岁的人。我国法律根据《中华人民共和国未成年儿童保护法》以及《联合国儿童权利公约》规定，儿童是指“18岁”以下的任何人。
