These derivatives are readily obtained by alkylation of 2 - mercaptopyridine and alkyl halides under alkaline conditions.这些衍生物可以容易地在碱性条件下通过 2- 巯基吡啶和卤代烷的烷基化而得到.The different contents of various alkylation products were ob...
Now that you've read that sentence, reread the one that precedes.既然你已读完那个句子, 那么就再读前面的.John felt blue when he reread Sally's letters.约翰重读莎莉的信时感到忧虑.He reread the article many times.这篇文章他反复读了许多遍....
Trees, undergrowth and creepers intertwined, blocking our way.树木、灌木丛与藤蔓植物盘根错节，挡住了我们的去路。He lay hidden by a mat of creepers.他躲在一簇攀缘植物后面.It clustered chimneys, its windows smothered in creepers.烟囱几个几个的丛集在一起, 窗户隐没在爬山虎中....