xylem development造句

例句与造句

1. The xylem development was'mesarch', i . e . the first maturing protoxylem had later maturing metaxylem on either side.
2. Much later, in 1967, it was shown that fossils called " " Psilophyton princeps " " had two very different patterns of xylem development : from the centre outwards ( centrarch ) in " P . princeps " and from the outside inwards ( exarch ) in " P . princeps " var . " ornatum ".
3. It's difficult to find xylem development in a sentence. 用xylem development造句挺难的