In C# you can flag a value type as a nullable type by adding ? after the type (like int? x;).

在C#中，你可以在一个允许为空的值类型后面加上一个问号（比如，int? x;）。

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SetTransportType (int x) : set the transport type to one of the following options.

setTransportType (int x)：将传送类型设置为下列选项之一。

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Python has a single string type, str, that behaves similarly to the version 2.x unicode type.

Python 具有单一的字符串类型 str，其功能类似于版本 2.x 的 unicode 类型。

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How about a Volvo S60 with all-wheel drive, or an X-Type Jaguar ?

FORBES: Overview

This, by the way, is the problem with Jaguar X-Type , a car that's also got all-wheel-drive and is sized too small for its price.

FORBES: Test Drives

Instead, physicians and diagnosticians have to print out the digital images on X-ray-type film or laser paper.

FORBES: Fact And Comment