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l(f)rg:2017-11-25 ݋:bin

1. Some areas of the deep sea are vulnerable frequent natural disturbances taking the form of intense currents mud slumps low oxygen and upwellings.

𰸣A

c~e`ijfrequently vulnerable natural disturbances

gģһЩطܵȻɔ_@Щɔ_Լ{ʽ

pumpkina䣺 Ǹijvulnerable to frequent natural disturbances

2. By 1920 the area of the United States under cultivation had more than doubled in just 50 years and the national population that surpassed 100 million.

𸣣B

c(gu)ɶZľs`öZľB~thatȥͺˡ

gģ1920_50ѽ(jng)˃ɱȫ˿Ҳ^100f

3. In the United States the first roads were paved in colonial times first with logs latest with cobblestones or brick depending on the region.

𰸣B

c~ԻʾȺĠB(ti)rlater

gģ·ֳؕr䁵һ_ʼľģ(j)؅^(q)ͬZʯuK

4. In physics sound is considered to be the waves of vibratory motion nether or not they are heard by the human ear.

𰸣C

cB~ʹñ_(d)e`ijwhether or not

gģϣ•J(rn)\Ӱl(f)IJ˶ܲ Ҋ

5. Over one thousand mineral are known most of which are characterized by definite chemical composition crystalline structure and physical properties.

𰸣B

cɔ(sh)~Ώ(f)(sh)`ijminerals

gģг^1ǧNV|(zh)֪кܶ඼ͨ^_ĻW(xu)MY(ji)Y(ji)(gu)ԱF(xin)ˡ

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