It is usually due to genetics or stress.
磨牙通常是由遗传或压力造成的。
About 50% of a person's chronotype is due to genetics.
大约50%的人的时间类型是由基因决定的。
And some of us may just be inclined to gain weight while others are not, due to genetics.
有些人可能就是易于发胖而另一部分人不会，这应归于遗传。
We are saying that about 50 percent of individual differences between people in intelligence is due to genetics.
我们是说，人与人之间的智力差异有半数与基因有关。
Some researchers thought the survival difference was due to genetics, but they could never find the gene responsible.
一些研究人员认为这两类小鼠之间的差异是源于基因的不同，但是他们未能发现基因方面存在的问题。
Likely cause: Known as bruxism, teeth-grinding varies from jaw clenching to ferocious grinding that wears teeth down to stumps. It is usually due to genetics or stress.
可能的诱发原因：虽说都叫磨牙症，但磨牙的情况各不相同，从牙关紧闭到疯狂磨牙直到牙齿只剩残根。磨牙通常是由遗传或压力造成的。
AI is usually used for crossbreeding with imported germplasm rather than for superior local genetics, due to the paucity of animal identification, recording and evaluation programmes.
由于缺乏动物识别、记录和评价计划，因而人工授精技术通常用于与进口种质资源的杂交，而并非当地的优良遗传资源。
It wasn't until two weeks before my due date that I finally requested the results of a first-trimester sonogram and genetics test be sent to my midwife.
直到预产期前两周我才最终要求把超音波和遗传学鉴定结果送到我的助产士那里去。
It wasn't until two weeks before my due date that I finally requested the results of a first-trimester sonogram and genetics test be sent to my midwife.
直到预产期前两周我才最终要求把超音波和遗传学鉴定结果送到我的助产士那里去。
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