Widows seem to experience more distress than do widowers.寡妇似乎比鳏夫更痛苦。We are and fatherless , our mothers are as widows.3我们是无父的孤儿; 我们的母亲好象寡妇.Even elderly widows and widowers choose to live on their own.连年迈的寡妇和鳏夫都选择独自生活.He ...
By using the complementation test an unknown mutant can be rapidly assigned to a particular gene.采用互补测验可迅速地将某一未知突变型归属于某一特定基因.When the cells were then shifted to an enriched medium, the mutant cells proliferated.然后,当细胞移入一...