1.   In addition, fertility medications have produced more twins.

2.   Twins and women who bore them would be less likely to survive than singletons and thus less likely to pass on a tendency to produce fraternal twins.

3.   A proper division would produce twins.

4.   Fraternal twins are produced when the mother releases more than one egg and both are fertilized.

5.   A rare Burmese bear has produced twins to become the first bear to give birth in captivity in Vietnam, the Vietnam News Agency reported Friday.

v. + twin >>共 155
have 10.27%
separate 7.57%
expect 4.86%
deliver 4.32%
place 2.97%
take 2.97%
join 2.43%
see 2.16%
include 1.89%
play 1.62%
produce 1.35%
produce + n. >>共 1722
result 3.89%
evidence 1.86%
weapon 1.01%
agreement 0.93%
show 0.90%
goods 0.89%
electricity 0.86%
product 0.85%
film 0.82%
document 0.79%
twin 0.03%
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