You can observe for a period of time, and if normal growth and development, it means that instead of eating too little;
你可以再观察一段时间,如果生长发育很正常,就表明不是吃得太少;
Baby say his first words before a clear need to listen and observe for a long time.
婴儿在说出他的第一个清晰的单词之前要聆听和观察很长一段时间。
NASA officials say it appears the repair job was successful but it would observe for a while before they can say that for sure.
美国航空航天局官员表示,修复工作似乎很成功,但在确定之前还要观察一段时间。
If you stand on one leg and observe for a time what you do to keep upright, you may notice that the adjustment to your posture can happen anywhere from your ankles all the way to your head.