His central thesis is that each generation produces deleterious mutations , so down the line of human history , our intelligence is ever more impaired compared to that of our predecessors .
The stronger currency has had none of the deleterious effects that critics warned of , such as harming employment-intensive export industries and causing financial instability .
Gene therapy refers to the technology of inserting genes into the patient 's cells to knock off their deleterious traits .
基因治疗指将基因注入患者细胞内这一技术,进而消除有害症状。
In fact , some experts worry that if people become too paranoid about online privacy , it could have deleterious effects .
事实上,一些专家担心,如果人们对在线隐私变得过于偏执,可能产生有害影响。
The authors of the study , presented to the scientific sessions of the american diabetes association , said policies to promote diet drinks " may have unintended deleterious effects " .
Perfectionism tends to have two components : a positive side , including things like setting high standards for themselves ; and a negative side , which involves more deleterious factors , such as having doubts and concerns over mistakes and feeling pressure from others to be perfect .
Lynch says that in a real population of organisms facing selection pressure to re-acquire a previously lost trait by " going backwards " , there will be plenty of intermediate " reverse " genes remaining in the pool , even ones that are deleterious .