第一行 用英语怎么说是in the first line

第一行 用英语怎么说是in the first line 在春天用英语怎么说是in the spring还是in spring? 19世纪30年代用英语怎么说是in 1930s 还是in the 1930s “在课堂上”用英语怎么说是“in class ”还是“in the class” “在草地上”用英语怎么说是on the grass 还是 in the grass 第11用英语怎么说是第11，郁闷 在生日用英语怎么说是用in the birthday还是on 2009年的冬天用英语怎么说是on the winter of 2009还是in the winter of 2009 用钢笔写字用英语怎么说是in开头的 “我在北京”用英语怎么说是 in还是 at 我发现小鸟唱歌在树上用英语怎么说是I found a bird singing in the tree还是I found a bird sing in the tree vivo hi-fi & smart 是什么.怎么用 connectify怎么用不了啊 总是有这个Wi-Fi is disabled.make sure your device is plugged in.if yourWi-Fi is disabled.make sure your device is plugged in.if your device has a hardware switch ,make sure it is in the 'on'position As a student ,you must (fi )the homework in time. l am in beijing for five days.on the fi 第一行是in the first line还是on the first line 第二十九届北京奥林匹克运动会用英语怎么说是the 29th olympic games in beijing还是the 29th beijing olympic games 在操场上用英语说是on the playground,还是in the playground这个?