例句與造句

1. Reproducible, inorganic low-temperature syntheses of dolomite and magnesite were published for the first time in 1999 . Those laboratory experiments showed how the initial precipitation of a metastable " precursor " ( such as magnesium calcite ) will change gradually into more and more of the stable phase ( such as dolomite or magnesite ) during periodical intervals of dissolution and re-precipitation.
2. It's difficult to find initial precipitation in a sentence. 用initial precipitation造句挺難的