Contact Tip Lock - Locks the unit and prevents firing.

联系提示锁-锁装置和防止射击。

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Welding current is transferred to the wire through the contact tip whose bore is slightly greater than the wire diameter.

焊接电流通过孔径稍大于焊丝直径的接触端传送到焊丝。

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The third tip is to make better use of online social networks, particularly to make contact with new people.

第三个点子是更好地利用当前各种社交网络，尤其是能和新人结交的。

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Another helpful tip: be familiar with each reporter you contact.

FORBES: How NOT to Write a Pitch Letter