Certain artifacts are especially vulnerable because some pioneers in plastic art didn't always know how to mix ingredients properly, says Thea van Oosten, a polymer chemist who, until retiring a few years ago, worked for decades at the Cultural Heritage Agency of the Netherlands.
某些文物尤其脆弱，因为一些塑料艺术的先驱者并不总是懂得如何正确地混合原料，荷兰文化 heritage 机构的聚合物化学家 Thea van Oosten 说，她几年前退休前一直在该机构工作了数十年。
have their ingredients analyzed
对其成分进行分析
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。