hit or miss

常见例句

Keeping the information between the two tools synchronized was a hit or miss proposition.
保持这两个工具间的信息同步是一个漫无目的的主张。
The network provides adequate coverage on the coasts (see map), but it's hit or miss in the middle of the country, and there are 12 states with no Sprint 4G service at all.
网络在沿海地区提供了足够的覆盖率，但却忽略了中部地区。在那里，有12个州压根就没有Sprint的提供的4G服务。
Ideally, I would love to use TrueCrypt to encrypt my USB drives in their entirety, but since having admin privileges is always hit or miss when traveling, it's a risk I can't afford to take.
理想上我希望使用TrueCrypt来完整加密U盘，但是因为在旅游时开启管理员权限是很麻烦的事情，很难能每次都做到。

So it's this interesting scenario where it's probably hit or miss, certainly early on and as one of the clips they are indicated, these are the kinds of things where computers ideally have to learn overtime.
因此，这是一个有意思的事情,因为它有可能是投其所好或者不对其胃口，当然继续,正如其中一个短片所示，这些东西需要计算机,花一些时间去学习。
哈佛公开课 - 计算机科学课程节选

Such books have a short shelf life and can be hit or miss.
FORBES: Booking Losses
Some people make money by price speculation, but that is hit or miss.
FORBES: The Next 10 Years
The job market, already hit or miss, would likely be put on pause.
FORBES: What a US Default, Downgrade Might Look Like