You may use a first name if you are asked to (call me …).
如果你得到允许的话,你便可以直呼某人的名字。
Dogs wag their tails not so much in love to you as your bread.
狗摇尾巴,爱的是面包。
and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.