happen upon造句

How do you happen upon these subjects?

But if scientists happen upon pure fusion, who knows what they might do with it?

Sometimes you may happen upon unique situations, it can be very hard or even funny.

If you happen upon a manzanita bush, chew the outer part of the fruit and spit out the hard seeds.

However, during my weekly routines, I did happen upon a wonderful picture-worthy scene that clearly told me: You are in China.

Turn a corner and you will happen upon the startling green of the winter harvest, of men bending over paddy fields with nothing for tools but their bare hands.