The capability is checked against null in the first part of the if clause.

If we got an if then statement are we asserting an antecedent, an if clause or the consequent, Q the then clause, or are we saying if P then Q.

如果我们的论述中有如果，我们在主张先行词，假设条件句或者结果，然后从句，或者我们说如果P那么。

If I were a boy again, I would look towards cheerful side.

假如我再回到童年，我会凡事都看光明的一面。

If I were a boy again I would look on the cheerful side.

假如我又回到了童年，我就要事事乐观。

If I were a boy again, I would cultivate courage.

如果我还是一个男孩，我将培养自己的勇气。

If I were a boy again, I would school myself to say no more often.

如果能再回到童年，我会经常说“不”。

This paper describes the preparation and service effects of a self-made rust preventer containing chlorhydric acid, organic acid, corrosion remover and water used for radiators and fuel tanks.

介绍了以盐酸、有机酸、缓蚀剂和水为原料自制的散热器与燃油箱除锈剂的配制方法和使用效果。

Test and Application of WCI-1 Water-Solved Rust Preventer

WCI-1水溶性防锈剂试验和使用

Development and Application of Sulphate Rust Preventer

硫酸型除锈液的研制与应用

Development and Application of Water-based Rust Preventer for Cast Blank

铸件毛坯水基防锈剂的研制与应用

Development of Low Hydrochloric Acid Rust Preventer for Steel

钢铁低浓度盐酸酸洗添加剂研制

The paper describes the performance and production application of the surface rust preventer developed to protect the CO2 shielded arc welding wires from rusting.

介绍了为解决二氧化碳气体保护焊焊丝锈蚀问题而研制的表面防锈剂的性能及其在生产上的应用。

Developing a rust preventer for CO_2 shielded are welding wire

二氧化碳气体保护焊焊丝防锈剂的研制

Prior to painting, surface treatment for rust prevention shall be given.

粉刷前，应对该表面所防锈处理。

Discussion on Rust Prevention for Iron Tower of Living Transmission Line

对运行输电线路铁塔防腐问题的探讨

Effect of Cu-plating Quality of Gas Shield Welding Wire on Its Rust Prevention Property

气保焊丝镀铜质量对其防锈性能的影响

Contains effective additives to enhance oxidation stability and rust prevention properties.

含有效添加剂以增进氧化稳定性及防锈性。

Even if the worst comes to the worst, we can always sell up our business here and start again somewhere else.

即使出现最坏的情况，我们也总可以随时在这里变卖商店，然后在其他地方另起炉灶。

If the worst comes to the worst, I will divorce her.

若是到了万不得已，我就和她离婚。

The situation may improve but if the worst comes to the worst I'll have to sell the house.

情况可能会好转，但是万一走投无路我就只好变卖房子。

If the worst comes to the worst, use the portable annihilator in your helmet.

如果最坏的最坏的情况下，使用便携式零化子您头盔。