Singletons, whether unmarried or divorced, are able to sign up for the roughest, toughest unaccompanied positions.

单身者, 无论未婚或离异, 都能够签约获得那些最难熬 、 艰苦的无伴从职位.

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But the procedure , known as pre - implantation genetic diagnosis ( PGD ) appears to be harmless for singletons.

但移植前遗传学诊断显示对单胎无害.

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