Leaving it out can cause problems such as being unable to pan at all or having additional layers badly misaligned on top of the base layer.

如果不指定，可能会出问题，比如根本不能平移或是有额外的层在基层上不能很好地对齐。

youdao

They've tended to buggy NAT implementations (such as being unable to contact your external address from the inside network), limited settings, bad DHCP implementations, and the like.

它们已经趋向于有缺陷的 NAT 实现（如不能从内网连接外部地址）、有限的设置、不好的 DHCP 实现之类。

youdao

The category is being promoted by wireless and graphics chipmakers such as Freescale, Nvidia, Marvell and Qualcomm, which have been unable to grab a significant share of the netbook market.

该类产品正由飞思卡尔、恩威·迪亚、迈威尔和高通等无线和图形芯片制造商推动，它们一直无法在上网本市场夺得显著份额。

youdao

Yet the odds of life-long disability such as cerebral palsy, blindness or being unable to walk, has not changed, at about one in five.

BBC: Severely premature babies: More survive being born early

As such sources are now nearly exhausted, military officers on the front lines of freedom face the prospect of being unable to help kick-start new projects or, worse yet, failing to complete some of those already underway.

CENTERFORSECURITYPOLICY: A call to greatness