The two sides met to put their signatures to a formal agreement.双方聚首签署一份正式协议。1.5 million signatures have been collected.已经收集到150万人的签名。These two signatures are very similar, can you tell them apart?这两处签名非常接近, 你能把它们区分开来 吗 ...
The number of cationic bromine and chlorine compounds is restricted.溴、氯阳离子化合物的数量受局限.Derivatives of bromine are much more active than the corresponding one of chlorine.溴的衍生物的活性要比相应的氯的衍生物大得多.The existing bromine in acetic ...