<正> A young couple were getting anxious about their four-year-old son, who hadnot yet talked. They took him to specialists, but the doctors found nothingwrong
<正> A good sailor knows all about ropes and how to tie theminto knots.From that we have this idiom,and it means toknow all there is about a job,a hobby,a busin
<正> There are robots all around us.Some do very complicated jobslike flying airplanes and driving subway trains.And some do onesimple job. When an automatic wa