Suddenly a bolt of lightning crackled through the sky.突然一道闪电划破长空。If the soil dries out the plants may bolt.如果土壤过干，植株可能会过早结实。Loosen the bolt so the bars can be turned.松一松插销，好转动门闩。...
The reactivity of wheat straw soda lignin ( WSSL ) can be improved by demethylation modification.麦草 碱木素在碱催化下经脱甲基改性可提高其反应活性.Benzbromarone was synthesized from salicylaldehyde by condensation with chloroacetone, reduction,...