'Pitch in' means: to join in and help with an activity.

Pitch in：加入并帮助开展一项活动。

Pitch in the Baroque era was actually lower than it is today.

巴洛克时期的音高要比现在低。

" Meet you on the pitch in fifteen minutes."

“一刻钟后在球场见。”

I really need you to pitch in, Mom.

我真的需要你的帮助 妈。

Unlike most men he knew, he really pitched in on the housework.

与他认识的大多数男人不同，他确实主动地帮助做家务。

Okay, what if he pitches in here?

要是他付钱呢？

Pitching in on the weekends, helping to plant the emus.

在周末的时候过去帮忙 帮助种植鸸鸟。

Why aren't you guys pitching in?

你们为什么不投球？

You want to -- you want to pitch in?

你要来贡献点力量吗？

Doctors who don't know how to pitch in.

因为医生根本就不会配合工作。

Should we go home? - I'm pitching in an hour.

我们该回家吗？ - 我一个小时后得上场投球。

It was a shared effort, where everybody pitched in for the communal good.

这是一项共同的努力，每个人都为公共利益而努力。

I want you to turn in story pitches in five days.

我希望你在五天后提交故事介绍。

Lala's father, Abu Hamad pitches in with setting up their tent.

Lala的父亲Abu Hamad在帐篷前吃饭。

He never pitched in the minor leagues, as most players do today.

他从未像今天的大多数球员那样在小联盟中投球。

He says Writebol was pitching in where they were treating ebola patients.

他表示，莱特博尔参与了治疗埃博拉患者的工作。

So Feller achieved his dream of pitching in the World Series.

所以费勒实现了他在世界大赛中投球的梦想。

That was the business plan pitched in the 1990s by Kary Mullis, an American biologist.

这是美国生物学家卡利·穆利斯在上世纪90年代提出的商业计划。

Why don't we all pitch in 50 bucks, we'll pool our money together..

我们可以各出资五十块 把钱集合起来。

A loose community of activists, architects and locals passionate about their city have pitched in.

一个由活动家、建筑师和对他们的城市充满热情的当地人组成的松散社区已经加入进来。