host occurrence of silver的用法和樣例：
例句
- The occurrences of vanadium are mainly in adsorption and isomorphism states.
釩的賦存狀態(tài)主要有吸附態(tài)和類(lèi)質(zhì)同象態(tài)。 - Occurrences of organic matter in Paleogene argillaceous rock of Jiyang depression are primarily studied by means of fluorescent microscopy.
應用熒光顯微鏡法，首次對濟陽(yáng)坳陷下第三系泥質(zhì)巖中有機質(zhì)的賦存狀態(tài)進(jìn)行了研究。
