Dr.Vallenas says many mothers are discouraged from breast-feeding because they do not know how to get their baby to latch on properly to the breast's nipple, or because they suffer pain and discomfort.
VOA: standard.2009.08.01
and they do not know how to fix the tire.
而车上的人对此束手无策。
I don't know how many kids, generation after generation, get in trouble because they do not remember the following fact.
我不知道有多少孩子,一代又一代,因为没有记住下面的内容而遇到困难
But Chad Reissig says scientists do not know a lot about them and how they interact with each other and caffeine.
VOA: special.2009.07.22
Unless you tell them what to do they're not gonna know how to do it.
除非你告诉它要做什么,它自己是不知道做什么的。
They do not know why da Vinci painted it, or how it ended up in the collection of French ruler Francis the First.
VOA: special.2010.06.23
We are worried because we do not know how long they will stay or how we will take care of them.
VOA: standard.2009.10.27
How do we know that they are not going to keep it all?" The United States and allies France and Russia have supported the IAEA draft deal with Iran as a means to alleviate concerns that Tehran is using its nuclear program to develop atomic weapons covertly.
VOA: standard.2009.10.28
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