They were Manchus who ruled China from the mid-17th to early 20th centuries and expanded the country's borders.
2
在处理边界条件时，采用了满足位移、速度、加速度条件的延拓边界条件。
In this case handling boundary conditions, the extended boundary conditions were used for supplying need of the displatment, velocity and acceleration conditions.
3
在开拓边疆的日子里，它充分表现出自己有能力监护自己，并确保了自己的生活。
During the frontier days it amply demonstrated its ability to monitor itself and ensure its survival.
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