But natural selection swings a sharp edge, and the teen's sloppier moments can bring unbearable consequences.
但是，自然选择是把双刃剑，青少年的草率会带来令人无法承受的后果。
Cuts can become infected if a person USES nonsterile or dirty cutting instruments - razors, scissors, pins, or even the sharp edge of the TAB on a can of soda.
如果一个人使用未经消毒或肮脏的切割工具——剃刀、剪刀、别针，甚至是一听汽水标签的尖锐边缘，切割可能会导致感染。
'it's a very clean cut,' said the Rat, examining it again attentively. 'That was never done by a branch or a stump. Looks as if it was made by a sharp edge of something in metal. Funny!'
“伤口很整齐，”河鼠再一次仔细检查他的腿。“绝不会是树枝或树桩划破的。看起来倒像是被什么锋利的金属家伙划的。怪事！”
The blade is hardened to maintain a long lasting sharp edge and is easily field replaceable.
刀片性能高，可保持长期的锋利边缘，现场更换简便。
Using pliers or a pipe wrench to tighten a bolt or nut. This may scar the bolt head or nut creating a sharp edge.
使用钳子或管扳手拧紧螺栓或螺帽。这样可能会刮伤螺栓头或螺帽，从而形成尖锐的边缘。
If something has been going on for billions of years, you wouldn't expect a sharp edge.
如果什么东西是存在了亿万年的，那么你就不用期待一个明显的边界。
Dual filters are adopted in the former algorithm, obtaining clear image with sharp edge and good visual impression.
前一种算法采用双滤波器结构，既保证了图像的清晰度又使其边界锐利，获得了较好的视觉效果。
Keeping a sharp edge on chisels and plane irons is absolutely necessary for the successful and safe use of these tools.
为了使凿刀和刨子好用且安全，必须保证他们的刃足够锋利。
Shocks, high temperature, or contacts of sharp edge components should not be allowed in battery pack assembling process.
在电池装配过程中不允许撞击、高温或接触尖锐部分。
The chronic lesions had an appearance of shrinking, sharp edge, even signals, and had no lunar circle phenomena and obvious enhancement.
慢性病灶有收缩感，边缘较锐利，信号较均匀，周围无晕环征象，增强后无强化。
The utility model relates to a chamfering machine for performing chamfering to the sharp edge of a leveling ruler body made of aluminum alloy section materials.
本实用新型是一种用于尺体采用铝合金型材制造的水平尺锐边进行倒角加工处理的倒角机。
This picture echoes an old Chinese poem: Sharp edge of a sword comes out from grinding, and plum blossom's fragrance comes from the bitter cold.
这张照片和一首中国古诗产生了共鸣：宝剑锋从磨砺出，梅花香自苦寒来。
This picture echoes an old Chinese poem: Sharp edge of a sword comes out from grinding, and plum blossom's fragrance comes from the bitter cold.
这张照片和一首中国古诗产生了共鸣：宝剑锋从磨砺出，梅花香自苦寒来。
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