笔记本内部器件的最高工作温度极限,要求在75°C-85°C以下，由于机器内部散热系统的作用，器件们通常是不会达到此极限值的；由于笔记本的结构原因，普通用户只能通过软件界面查看各主要部件工作温度，或用手触摸本子外壳感知温度高低，当外壳很热时，约40°C多一点；烫手时，不到50°C，但本子内部温度要高出十几度的，长期高温环境下工作，器件的寿命会缩短的。
Is it worth buying T450 or X250?
Performance-wise, both models are quite similar. The US version of T450s doesn't have an integrated graphics card; instead, it uses dual copper tubes with single fans for cooling. The X250 has been downsized to single copper tubes and single fans, but the performance difference isn't too significant.
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If you need more battery life and portability, go for the X250 over the T450S. However, if you're looking for better display quality and longer battery life, consider getting the T450S.
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While the X250 might be slightly cheaper in terms of price and quality, the T450 is definitely a better option as it's more durable and offers better performance compared to the X250. Additionally, the T450S has a carbon fiber casing and stronger防滚架，而且C面还用了镁铝合金材质，虽然同样为濠头，但结实程度远超X250。
Lastly, ThinkPad Helix 2 is another great option. It continues its 11.6-inch touch screen design, which features a 1080p Full HD resolution with Gorilla Glass for durability. It comes with an Intel Core M 5Y10 processor, 4GB RAM, and 128GB SSD, supporting Wi-Fi 802.11ac and Bluetooth 4.0. According to Lenovo's official data, the ThinkPad Helix 2 can last up to 8 hours in tablet mode and extend to 12 hours in laptop mode.