For many developers, learning Objective-C was seen as a huge barrier-to-entry.

对于很多开发人员，学习Objective - c被看作是一个巨大的障碍。

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The entry barrier is extremely low, especially for a programmer who has experience with a C-like language.

入门极其容易，尤其是对于已经具有 C 类语言的经验的程序员来说。

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C. on Sunday will coordinate a final push to break through the one billion barrier.

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Consequently, in the Commission's view, section 405(a)(14) of IRFA, 22 U.S.C. 6445(a)(14), gives you power now to raise such a barrier in the form of a prohibition against the purchase of China bonds by U.S. financial institutions such as underwriters, pension plans or mutual funds.

CENTERFORSECURITYPOLICY: Center For Security Policy