Dust storms very probably happen on hot summer days, and it's not safe for people to travel during this period.
沙尘暴很可能发生在炎热的夏天,在这个时期人们旅行是不安全的。
2
Throughout this period food became cheaper, safe and more reliable.
在此期间,食物变得更便宜、更安全、更可靠。
3
It is essential therefore that infants receive appropriate, adequate and safe complementary foods to ensure the right transition from the breastfeeding period to the full use of family foods.