These machines can accept payment through facial recognition______ a matter of seconds.
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Both Alipay and WeChat are gradually laying ____ the face-scanning payment market.
A. down
B. in
C. out
The convenience brought __________ mobile payment is obvious.
A. from
B. in
C. by
Biotechnology (生物技术) is gradually being introduced _______ the market.
A. from
B. into
C. by
We must __________ the protection in technology, law, and other aspects
A. stong
B. strength
C. strengthen