英语语法分析

Heatsink was not detected.

未检测到散热器。

Secondly, the thermal conductivity of heatsink better.

其次，散热片的导热性要好。

Enclosure has no vent opening. Enclosure dimensions exclude the external aluminum heatsink.

外包装没有通风口。外包装尺寸并不包括外置铝散热片。