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1.Their discovery is a new ingredient that could slow down the rate at which ice cream melts and gives the ice cream a smooth texture.
slow down（使）慢下来；（使）生产缓慢
There is no cure for the disease, although drugs can slow down its rate of development.
尽管药物可以减缓病情的发展，但是这种病仍然是不治之症。
2.It has been fun working on the applied use of a protein that was initially identified due to its practical purpose in bacteria.
work on从事于…
The company undertakes mechanical work on all types of cars.
该公司承接各类汽车的修理工作。
