Health officials also said that immunity from only two doses decreases over time.

卫生官员还表示，只接种两针的免疫力会随着时间的推移而下降。

Perhaps you're not out and about enough? Sun exposure increases serotonin and decreases melatonin, leaving you happier and more energized.

可能你在外面活动的时间还不够多？日晒可以增加血清素、减少褪黑素，让你心情更愉悦、身体更有活力。

This condition decreases sexual desire and responsiveness.

这种情况会降低性的欲望和敏感。

Contrary to popular belief, moderate exercise actually decreases your appetite.

与大部分人的想法相反，适度的运动实际上会降低食欲。

The flexibility of the lens decreases with age; it is therefore common for our sight to worsen as we get older.

眼球晶状体的柔韧性随着年龄的增长而降低；因此普遍的情况是随着我们年纪变老，我们的视力就会变差。

Tolerance to alcohol decreases with age.

酒量随年龄的增大而减少。

The tidal stream or current gradually decreases in the shallows.

浅滩上的潮水逐渐退去。