Autism is more common in boys than girls. What causes it is not clear. Scientists are studying genes and possible environmental influences.
自闭症在男孩中更为常见，其成因尚不明确。科学家正在研究基因和环境可能造成的影响。
________________________________________________________________. Rebecca Landa is a researcher at the Kennedy Krieger Institute and Johns Hopkins University School of Medicine in Maryland. Professor Landa wanted to find out what differences in development might be seen earlier. She led a new study that observed 235 babies between six and 36 months of age.
丽贝卡·蓝达（Rebecca Landa）是位于马里兰州的约翰霍普金斯大学医学院和肯尼迪克里格研究所的一名研究人员。蓝达教授希望找出发育上的早期差别。她领导一项新研究对235名年龄在6到36个月的婴儿进行了观察。
