half concealing

吞半吐───Swallow and spit;半───half

To make the nest, the swallow had to spit out its own saliva. But then when people came and robbed the nest, it had to continue by making another nest.───燕子为了筑巢，必须吐出它的唾液，若是燕窝被人夺走，它就得再另外筑个巢。

Sometimes, you are so polite, you don't spit out the bones, you chew them and try to swallow them.───通常，出于礼貌考虑，你不会吐出骨头，而是反复咀嚼试图将骨头咽下去。

If you try it, bite or clip off the rind of the nut, then chew it like gum — don't swallow it and be sure to spit out the juice, otherwise you're likely to get sick to your stomach.───如果你愿意尝尝的话，要先咬掉或者剪掉槟榔壳，然后像嚼口香糖一样咀嚼槟榔。别咽下去，而且一定要把槟榔汁吐出来，要不然你的胃可能会不舒服。