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to phrases
spark hardening
auto.
电火花硬化
淬火
shipb.
电火花淬火
tech.
电火花硬化
spark
discharge
hardening
met.
火花放电硬化
法
;
电火花硬化
法
spark hardening
:
2 phrases
in 2 subjects
Electronics
1
Technology
1
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