试一下的英文：
have a go at

Have a go, please!
请试一下吧！

I will have a try even though I should fail.
哪怕失败，我也要试一下。

"May I try out this ballpoint pen, please? "
我试一下这支圆珠笔可以吗

Do you think I should try a large size?
你看我应该试一下大号的吗?

Test the pumpkin pieces for tenderness with a skewer then tip into a mixing bowl.
用串肉杆试一下南瓜的软度，然后把它倒入碗中混合。

If the plate tarnishes, you can rub it up a little and bring back its shine.
如果盘子失去光泽，你可以稍为擦试一下，使其恢复光泽。