The original artificialvalve must be large enough for the new valve to fit inside.
最初的人工瓣膜必须足够大，以使新瓣膜可以放入其中。
2
There was nothing to fall back on so valvular surgery without an artificialvalve - at least as a backup - was a very dangerous game to play.
所以，没有人造瓣膜的瓣膜手术是一个非常危险的游戏。
3
Children who had an artificialvalve replacement may need to take anticoagulants (blood thinners) to prevent blood clots from forming on the artificialvalve surfaces.