见解析
1.He has poor eyesight and wears small,round glasses.
2.Lili wants to be a singer and travel around the world when she grows up.
3.You should clean the fish tank three times a day.
1.poor eyesight表示视力差的含义，wear表示戴着的含义，small and round glasses表示小而圆的眼睛的含义，故本句可翻译为He has poor eyesight and wears small,round glasses.
2.want to be表示想成为的含义，a singer表示一名歌手的含义，travel around 铁盒world表示周游世界的含义，when引导时间状语从句，用一般现在代替将来，grow up 表示长大的含义，故本题可翻译为Lili wants to be a singer and travel around the world when she grows up.
3.should为情态动词应该的含义，后跟动词原形，clean the fish tank表示打扫浴鱼缸的含义，three times a day表示一天三次的含义，故本题可翻译为You should clean the fish tank three times a day.
