若出行时间较长(3天以上)或需携带露营装备，则要选一个大包，以50升- 70升为宜。
If the longer travel time (3 days) or the need to carry camping equipment, should choose a large bag, with 50 liters -70 liters appropriate.
如果出行时间较短(1 - 3天)，且不准备在户外宿营，携带物品不多，宜选中小容积的背包，一般25升至45升就够了。
If a shorter travel time (1-3 days), and was not prepared to outdoor camping, carrying goods is not much, should choose small volume of the backpack, generally 25 to 45 liters is enough.
对准妈妈们来说正确的饮水方法应该是：在怀孕早期每天摄入的水量以1000～1500毫升为宜，孕晚期则最好控制在1000毫升以内。
The mother is right on the water method should be: in early pregnancy a daily dose of 1000 ~ 1500 ml water, it is advisable that late in pregnancy in 1000 ml is the best control within.
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