By increasing the weld heat input, the distribution of martensite becomes more dispersive and glomerate due to the molten pool stiring, the welding stress and the burning loss of alloy elements.

随着焊接热输入量的增加，由于熔池搅拌、焊接应力、合金元素烧损等原因，马氏体的分布更加散乱和密集；

youdao

Before I answer your question, let me clarify that while metabolism does drop with age (about 3 percent per decade) due to muscle loss and hormonal changes, it does not drop with exercise, but rather increases due to direct calorie burning during your workouts and indirectly through an increase in muscle mass as a result of your workouts.

CNN: What's the best way to 'kick-start' my metabolism?