Special control system. The internal structure applies acid-proof and alkali-proof design, so as to prolong the product life.

特殊化控制系统设计，内部结构采用防酸、碱设计，延长使用寿命。

youdao

Effective use of a theorem prover requires a solid understanding of the internal operations of the tool and a familiarity with the mathematical proof process.

高效地使用定理证明需要对工具的内部操作有坚实的理解并且熟悉数学证明过程。

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Based on internal algorithm, a generalized variable metric projection internal algorithm for nonlinear programming with linear constraints and the convergence proof are given.

基于内点算法的思想，利用广义投影技术构造了一求解线性约束的非线性规划问题的变尺度方向内点算法，并给出了其收敛性证明。

youdao

Its fully sealed design protects internal components, making it drop-proof, shock-proof, spill-proof, dust-proof, and watertight.

ENGADGET: GammaTech rugged T7Q launches at $2k and up, promptly steals your iPad's lunch money

The cellphone substantiation provision was needed because the Internal Revenue Service has strict, congressionally ordered rules requiring proof you made a donation if you want to take it as a tax deduction.

FORBES: Charitable Giving