But also be careful that you don't end up over-extending yourself today.
而且小心您不导致今天过分扩展。
2
The explanation may be in Earth's mantle, the layer of rock underlying the tectonic plates and extending down over 1,800 miles to the outer edge of Earth's iron core.
解释可能是在地球的地幔中，这是在构造板块下面的岩石层，向下延伸超过1800英里到地球铁芯的外边缘。
3
Extending life grows medically feasible, but it is often a life deprived of everything, and one exposed to degrading neglect as resources grow over-stretched and politics turn mean.