Calcium can continue strengthening your bones until the age of 20 to 25 when peak bone mass is reached.

在20-25岁之前，补充钙质可以促进骨骼的发育。

These impact exercises will help to build up bone mass needed later in life.

这些影响练习将有助于建立以后生活所需的骨量。

Factors that accelerate bone mass loss and increase the risk of osteoporosis are low estrogen levels, like after menopause, and low serum calcium.

加剧骨量流失和增加骨质疏松风险的因素有：绝经后较低的雌激素水平，以及较低的血清钙水平。

The better your bone mass, the less likely you are to develop osteoporosis when you get older.

您的骨量越好，您长大后患骨质疏松症的可能性就越小。

A year later, the effects begin to compound, and some studies in women have even shown a decrease in bone mass upwards of 1% every year.

一年后，这种影响开始恶化，一些针对女性的研究甚至显示，久坐会使骨量每年减少1%以上。

Ok, now, when osteoclasts break down bone faster than the osteoblasts can rebuild it, it results in the lowering of the bone mass and eventually in osteoporosis.

那么，当破骨细胞分解骨骼的速度比造骨细胞重建骨骼更快时，骨量就会减少，最终导致骨质疏松。

The balance between these regulatory factors results in a peak bone mass, usually by age 20 to 29 - and this usually occurs earlier in females than in males.

这些调节因子之间的平衡决定了人体内骨量的峰值，这个峰值通常在20到29岁之间出现，且通常对于女性来说会更早地出现。

Because there's more bone breaking than bone making going on, everything is out of balance, and suddenly people start experiencing 1 to 2 percent monthly loss in bone mass.

因为骨折比骨骼制造更多，一切都失去了平衡，突然之间，人们开始经历每月 1% 到 2% 的骨量损失。

That means testosterone and the synthetic steroids based on it promote body and facial hair growth, enlargement of the vocal cords and deepening of the voice, increased muscle mass and strength, and increased stature and bone mass.

这意味着睾酮和基于它的合成类固醇促进身体和面​​部毛发的生长、声带的增大和声音的低沉、 肌肉质量和力量的增加以及身高和骨量的增加。